https://sprg.ssl.berkeley.edu/~tohban/wiki/index.php?title=3D_Magnetic_Reconnection_at_a_Coronal_Null_Point&feed=atom&action=history3D Magnetic Reconnection at a Coronal Null Point - Revision history2024-03-28T19:08:52ZRevision history for this page on the wikiMediaWiki 1.16.0https://sprg.ssl.berkeley.edu/~tohban/wiki/index.php?title=3D_Magnetic_Reconnection_at_a_Coronal_Null_Point&diff=10750&oldid=prevSchriste at 17:52, 22 August 20182018-08-22T17:52:03Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|second_author = Aidan O'Flannagain and Peter Gallagher</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|second_author = Aidan O'Flannagain and Peter Gallagher</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|publish_date = 30 July 2018</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|publish_date = 30 July 2018</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|next_nugget= <del class="diffchange diffchange-inline">Return currents</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|next_nugget=<ins class="diffchange diffchange-inline">{{#ask: [[Category:Nugget]] [[RHESSI Nugget Index::330]]}}</ins></div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|previous_nugget=[<del class="diffchange diffchange-inline">http</del>:<del class="diffchange diffchange-inline">//sprg.ssl.berkeley.edu/~tohban/wiki/index.php/The_true_dawn_of_multimessenger_astronomy Multimessenger</del>]</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|previous_nugget=<ins class="diffchange diffchange-inline">{{#ask: </ins>[<ins class="diffchange diffchange-inline">[Category</ins>:<ins class="diffchange diffchange-inline">Nugget]] [[RHESSI Nugget Index::328]</ins>]<ins class="diffchange diffchange-inline">}}</ins></div></td></tr>
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</table>Schristehttps://sprg.ssl.berkeley.edu/~tohban/wiki/index.php?title=3D_Magnetic_Reconnection_at_a_Coronal_Null_Point&diff=10491&oldid=prevHhudson at 14:55, 31 July 20182018-07-31T14:55:56Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|second_author = Aidan O'Flannagain and Peter Gallagher</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|second_author = Aidan O'Flannagain and Peter Gallagher</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|publish_date = 30 July 2018</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|publish_date = 30 July 2018</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|previous_nugget=[http://sprg.ssl.berkeley.edu/~tohban/wiki/index.php/The_true_dawn_of_multimessenger_astronomy Multimessenger]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|previous_nugget=[http://sprg.ssl.berkeley.edu/~tohban/wiki/index.php/The_true_dawn_of_multimessenger_astronomy Multimessenger]</div></td></tr>
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</table>Hhudsonhttps://sprg.ssl.berkeley.edu/~tohban/wiki/index.php?title=3D_Magnetic_Reconnection_at_a_Coronal_Null_Point&diff=10483&oldid=prevHhudson: authors's edits2018-07-25T17:44:52Z<p>authors's edits</p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>associated with this region, with the radio imaging </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>associated with this region, with the radio imaging </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>matching the X-shape feature in AIA 171 &Acirc; as it rotated</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>matching the X-shape feature in AIA 171 &Acirc; as it rotated</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>across the disk. The NRH observations were further analysed to</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>across the disk. </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>The NRH observations were further analysed to</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>obtain the brightness temperature and longitudinal extent of</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>obtain the brightness temperature and longitudinal extent of</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>the radio source see Fig 3 (bottom). Just before the collapse there</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>the radio source see Fig 3 (bottom). </div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>is a small decrease in brightness temperature at all frequencies <del class="diffchange diffchange-inline">during </del>the collapse</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Just before the collapse there</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>is a small decrease in brightness temperature at all frequencies<ins class="diffchange diffchange-inline">.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">During </ins>the collapse</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>the is a simultaneous sharp rise in all frequencies which is followed</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>the is a simultaneous sharp rise in all frequencies which is followed</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>by a peak in emission from higher frequency channels which moves</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>by a peak in emission from higher frequency channels which moves</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>to lower frequency channels over the subsequent 10 minutes. <del class="diffchange diffchange-inline">The</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>to lower frequency channels over the subsequent 10 minutes. </div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>extent of the radio source increases just before the collapse,</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">The </ins>extent of the radio source increases just before the collapse,</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>before decreasing and returning to a similar value as before the</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>before decreasing and returning to a similar value as before the</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>collapse.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>collapse.</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>3D null point, and vertical dashed lines correspond to the three</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>3D null point, and vertical dashed lines correspond to the three</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>time intervals used to produce the three panels in Figure 2. (b)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>time intervals used to produce the three panels in Figure 2. (b)</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Timedistance plots for the 193 &Acirc; channel. Overlaid on both time-distance</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Timedistance plots for the 193 &Acirc; channel. </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Overlaid on both time-distance</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>plots are dash-dotted lines indicating approximate velocities of</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>plots are dash-dotted lines indicating approximate velocities of</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>the flow features from which they are offset. (c) NRH brightness</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>the flow features from which they are offset. (c) NRH brightness</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Time-distance maps were extracted from the AIA data along to curved</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Time-distance maps were extracted from the AIA data along to curved</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>segments as shown in Figure 1. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>segments as shown in Figure 1. </div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Gradual (1 km/s) and fast (5 km/s) inflow phases, as well as <del class="diffchange diffchange-inline">a </del>fast (30 km/s) and rapid (<del class="diffchange diffchange-inline">80100 </del>km/s) outflow </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Gradual (1 km/s) and fast (5 km/s) inflow phases, as well as fast (30 km/s) and rapid (<ins class="diffchange diffchange-inline">80-100 </ins>km/s) outflow </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>phases were found during the collapse (Figure 3). </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>phases were found during the collapse (Figure 3). </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The reconnection rate</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The reconnection rate</div></td></tr>
</table>Hhudsonhttps://sprg.ssl.berkeley.edu/~tohban/wiki/index.php?title=3D_Magnetic_Reconnection_at_a_Coronal_Null_Point&diff=10482&oldid=prevHhudson at 17:40, 25 July 20182018-07-25T17:40:53Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|number = 329</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|number = 329</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|first_author = Shane Maloney</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|first_author = Shane Maloney</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|second_author = Aidan O'Flannagain</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|second_author = Aidan O'Flannagain <ins class="diffchange diffchange-inline">and Peter Gallagher</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|publish_date = 30 July 2018</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|publish_date = 30 July 2018</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|next_nugget= TBD</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|next_nugget= TBD</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>In the case presented in this Nugget, we think instead that the reconnection </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>In the case presented in this Nugget, we think instead that the reconnection </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>occurs at a 3D coronal null point (Ref. [1]).</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>occurs at a 3D coronal null point (Ref. [1]).</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>This <del class="diffchange diffchange-inline">study </del>employs data from many instruments:</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>This <ins class="diffchange diffchange-inline">work </ins>employs data from many instruments:</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[http://aia.lmsal.com SDO/AIA],</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[http://aia.lmsal.com SDO/AIA],</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>[http://hmi.stanford.edu SDO/<del class="diffchange diffchange-inline">HMK</del>],</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>[http://hmi.stanford.edu SDO/<ins class="diffchange diffchange-inline">HMI</ins>],</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>the [https://www.obs-nancay.fr/-Radioheliographe-.html?lang=fr Nançay Radioheliograph]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>the [https://www.obs-nancay.fr/-Radioheliographe-.html?lang=fr Nançay Radioheliograph]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>and </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>and </div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>09:45. Before this collapse four loop structures are visible in 171</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>09:45. Before this collapse four loop structures are visible in 171</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>A channel while after the collapse the northern and western segments</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>A channel while after the collapse the northern and western segments</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>are no longer visible </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>are no longer visible<ins class="diffchange diffchange-inline">.</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:329f1.png|400px|thumb|center|Figure 1: </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[File:329f1.png|400px|thumb|center|Figure 1: </div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>SDO/HMI observation were used as input for multipole magnetic field</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>SDO/HMI observation were used as input for <ins class="diffchange diffchange-inline">''mpole'' </ins>multipole magnetic field</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>extrapolation, the results of which are shown in Figure 2. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>extrapolation, the results of which are shown in Figure 2. </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The extrapolation shows an X-shaped feature which is consistent with</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The extrapolation shows an X-shaped feature which is consistent with</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>During the partial collapse soft X-ray emission was detected in</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>During the partial collapse soft X-ray emission was detected in</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>both RHESSI and GOES. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>both RHESSI and GOES. </div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Figure 1 shows time profiles of the GOES 1-8 &Acirc; and RHESSI <del class="diffchange diffchange-inline">366 </del>keV channels. </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Figure 1 shows time profiles of the GOES 1-8 &Acirc; and RHESSI <ins class="diffchange diffchange-inline">3-6 </ins>keV channels. </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Additionally RHESSI imaging allowed</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Additionally RHESSI imaging allowed</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>the source to be localised to a region to the south of the X-shape</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>the source to be localised to a region to the south of the X-shape</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>feature where a footpoint of one of the loops is believed to terminate.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>feature where a footpoint of one of the loops is believed to terminate.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Time-distance maps were extracted from the AIA data along to curved</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Time-distance maps were extracted from the AIA data along to curved</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>segments as shown in Figure 1. Gradual (1 km/s) and fast (5 km/s)</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>segments as shown in Figure 1. </div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>inflow phases, as well as a fast (30 km/s) and rapid (80100 km/s)</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Gradual (1 km/s) and fast (5 km/s) inflow phases, as well as a fast (30 km/s) and rapid (80100 km/s) <ins class="diffchange diffchange-inline">outflow </ins></div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>were found during the collapse (Figure 3). </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">phases </ins>were found during the collapse (Figure 3). </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The reconnection rate</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The reconnection rate</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>can be estimated as M<sub>A</sub> = V<sub>In</sub>/V<sub>A</sub> ~ V<sub>In</sub>/V<sub>Out</sub>. </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>can be estimated as M<sub>A</sub> = V<sub>In</sub>/V<sub>A</sub> ~ V<sub>In</sub>/V<sub>Out</sub>. </div></td></tr>
</table>Hhudsonhttps://sprg.ssl.berkeley.edu/~tohban/wiki/index.php?title=3D_Magnetic_Reconnection_at_a_Coronal_Null_Point&diff=10479&oldid=prevHhudson at 02:42, 23 July 20182018-07-23T02:42:51Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>signature of accelerated particles (Ref. [3]).</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>signature of accelerated particles (Ref. [3]).</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"> </del>== References ==</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>== References ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[1] [http://adsabs.harvard.edu/abs/2018arXiv180609365O "Three-dimensional magnetic reconnection in a collapsing coronal loop system"]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[1] [http://adsabs.harvard.edu/abs/2018arXiv180609365O "Three-dimensional magnetic reconnection in a collapsing coronal loop system"]</div></td></tr>
</table>Hhudsonhttps://sprg.ssl.berkeley.edu/~tohban/wiki/index.php?title=3D_Magnetic_Reconnection_at_a_Coronal_Null_Point&diff=10478&oldid=prevHhudson at 02:42, 23 July 20182018-07-23T02:42:18Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[3] [http://adsabs.harvard.edu/abs/2005A%26A...436.1103D "Particle acceleration at a three-dimensional reconnection site in the solar corona"]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[3] [http://adsabs.harvard.edu/abs/2005A%26A...436.1103D "Particle acceleration at a three-dimensional reconnection site in the solar corona"]</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">[Macintosh-00254bc9f6e8-2:nuggets/2018/maloney] hughhudson%</del></div></td><td colspan="2"> </td></tr>
</table>Hhudsonhttps://sprg.ssl.berkeley.edu/~tohban/wiki/index.php?title=3D_Magnetic_Reconnection_at_a_Coronal_Null_Point&diff=10477&oldid=prevHhudson: completed draft of 3292018-07-23T02:38:02Z<p>completed draft of 329</p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>In the case presented in this Nugget, we think instead that the reconnection </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>In the case presented in this Nugget, we think instead that the reconnection </div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>occurs at a 3D coronal null point (Ref. [<del class="diffchange diffchange-inline">2</del>]).</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>occurs at a 3D coronal null point (Ref. [<ins class="diffchange diffchange-inline">1</ins>]).</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>This study employs data from many instruments:</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>This study employs data from many instruments:</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[http://aia.lmsal.com SDO/AIA],</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[http://aia.lmsal.com SDO/AIA],</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[http://hmi.stanford.edu SDO/HMK],</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[http://hmi.stanford.edu SDO/HMK],</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>the [https://www.obs-nancay.fr/-Radioheliographe-.html?lang=fr Nançay <del class="diffchange diffchange-inline">Radiohelioaph</del>]</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>the [https://www.obs-nancay.fr/-Radioheliographe-.html?lang=fr Nançay <ins class="diffchange diffchange-inline">Radioheliograph</ins>]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>and </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>and </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[https://www.solarmonitor.org GOES]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[https://www.solarmonitor.org GOES]</div></td></tr>
<tr><td colspan="2" class="diff-lineno">Line 78:</td>
<td colspan="2" class="diff-lineno">Line 78:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>above, overlaid on the HMI line-of-sight magnetogram produced before</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>above, overlaid on the HMI line-of-sight magnetogram produced before</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>(left), during (middle), and after (right) the collapse of the 3D</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>(left), during (middle), and after (right) the collapse of the 3D</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>null point. Blue filled circles lie on the locations of <del class="diffchange diffchange-inline">NRH </del>centroids,</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>null point. Blue filled circles lie on the locations of <ins class="diffchange diffchange-inline">radio </ins>centroids,</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>and the colours match the correlation to frequency <del class="diffchange diffchange-inline">given in Figure</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>and the colours match the correlation to frequency<ins class="diffchange diffchange-inline">. </ins></div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">2. </del>Overplotted onto each frame as a black dashed line is the location</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Overplotted onto each frame as a black dashed line is the location of the </div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>of the </div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[https://en.wikipedia.org/wiki/Magnetic_reconnection magnetic separator] </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[https://en.wikipedia.org/wiki/Magnetic_reconnection magnetic separator] </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>that passes closest to the radio brightness centroids. The three</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>that passes closest to the radio brightness centroids. The three</div></td></tr>
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<td colspan="2" class="diff-lineno">Line 92:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>The <del class="diffchange diffchange-inline">Nancay </del>Radioheliograph observations show a Type 1 noise storm</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>The <ins class="diffchange diffchange-inline">Nançay </ins>Radioheliograph observations show a Type 1 noise storm</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>associated with this region, with the radio imaging </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>associated with this region, with the radio imaging </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>matching the X-shape feature in AIA 171 &Acirc; as it rotated</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>matching the X-shape feature in AIA 171 &Acirc; as it rotated</div></td></tr>
<tr><td colspan="2" class="diff-lineno">Line 124:</td>
<td colspan="2" class="diff-lineno">Line 123:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>respectively.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>respectively.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>]]</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>== References ==</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">During the partial collapse soft X-ray emission was detected in</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">both RHESSI and GOES. </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">Figure 1 shows time profiles of the GOES 1-8 &Acirc; and RHESSI 366 keV channels. </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">Additionally RHESSI imaging allowed</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">the source to be localised to a region to the south of the X-shape</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">feature where a footpoint of one of the loops is believed to terminate.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">Time-distance maps were extracted from the AIA data along to curved</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">segments as shown in Figure 1. Gradual (1 km/s) and fast (5 km/s)</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">inflow phases, as well as a fast (30 km/s) and rapid (80100 km/s)</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">were found during the collapse (Figure 3). </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">The reconnection rate</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">can be estimated as M<sub>A</sub> = V<sub>In</sub>/V<sub>A</sub> ~ V<sub>In</sub>/V<sub>Out</sub>. </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">Using this approximation the reconnection rate was estimated as M<sub>A</sub> = 0.06.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">== Conclusions ==</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">A solar radio noise storm exhibited a close and </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">consistent association with a quadrupolar transequatorial loop</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">structure for its full passage across the disk. </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">The interpretation of this noise storm as plasma emission produced indirectly by</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">accelerated electrons at a 3D magnetic null point supports the idea</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">that boundaries between interacting or transequatorial active regions</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">are ideal locations for nonflaring reconnection due to their opposite</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">magnetic polarity orientations (Ref. [2]).</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">Beyond this longterm relationship, we have investigated the behaviour</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">of the radio sources during a rapid collapse of the 3D null point</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">structure, as observed in AIA. </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">We have interpreted the variation</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">in radio brightness temperature as a fall and subsequent rise in</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">accelerated electron population caused by the change in electric</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">drift rate as magnetic fields are swept into and then out of the</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">acceleration region. </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">Our interpretation builds a complete picture</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">of both nonflaring and impulsive reconnection by combining observations</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">of coronal inflows and outflows at 3D null points with an associated</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">signature of accelerated particles (Ref. [3]).</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline"> </ins>== References ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[1] [http://adsabs.harvard.edu/abs/2018arXiv180609365O "Three-dimensional magnetic reconnection in a collapsing coronal loop system"]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[1] [http://adsabs.harvard.edu/abs/2018arXiv180609365O "Three-dimensional magnetic reconnection in a collapsing coronal loop system"]</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[2] [http://adsabs.harvard.edu/abs/1975ApJ...196L.129S "The reconnection of magnetic field lines in the solar corona"]</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[3] [http://adsabs.harvard.edu/abs/2005A%26A...436.1103D "Particle acceleration at a three-dimensional reconnection site in the solar corona"]</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[Macintosh-00254bc9f6e8-2:nuggets/2018/maloney] hughhudson%</ins></div></td></tr>
</table>Hhudsonhttps://sprg.ssl.berkeley.edu/~tohban/wiki/index.php?title=3D_Magnetic_Reconnection_at_a_Coronal_Null_Point&diff=10476&oldid=prevHhudson: More of 329. Almost there.2018-07-22T18:47:21Z<p>More of 329. Almost there.</p>
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<td colspan='2' style="background-color: white; color:black;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black;">Revision as of 18:47, 22 July 2018</td>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">SDO/HMI observation were used as input for multipole magnetic field</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">extrapolation, the results of which are shown in Figure 2. </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">The extrapolation shows an X-shaped feature which is consistent with</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">the EUV observations. </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">A combination of EUV observations and extrapolation results suggests</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">that this feature is a coronal null point. </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[[File:329f2.png|500px|thumb|center|Figure 2: </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">Results from multipole potential field extrapolations based on</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[http://hmi.stanford.edu SDO/HMI] photospheric Zeeman observations. Top: Samples</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">of extrapolated potential magnetic field lines (white), viewed from</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">above, overlaid on the HMI line-of-sight magnetogram produced before</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">(left), during (middle), and after (right) the collapse of the 3D</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">null point. Blue filled circles lie on the locations of NRH centroids,</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">and the colours match the correlation to frequency given in Figure</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">2. Overplotted onto each frame as a black dashed line is the location</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">of the </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[https://en.wikipedia.org/wiki/Magnetic_reconnection magnetic separator] </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">that passes closest to the radio brightness centroids. The three</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">times were chosen to match those shown in Figure 1. Bottom: The</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">same magnetic field lines and radio sources shown in the top row</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">are shown again, viewed at an angle to represent the 3D structure</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">of the field. The dashed line again refers to the separator. Radio</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">source heights are estimated directly from the </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[https://en.wikipedia.org/wiki/Corona "onefold Newkirk model"] of </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">coronal density structure.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">]]</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">The Nancay Radioheliograph observations show a Type 1 noise storm</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">associated with this region, with the radio imaging </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">matching the X-shape feature in AIA 171 &Acirc; as it rotated</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">across the disk. The NRH observations were further analysed to</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">obtain the brightness temperature and longitudinal extent of</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">the radio source see Fig 3 (bottom). Just before the collapse there</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">is a small decrease in brightness temperature at all frequencies during the collapse</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">the is a simultaneous sharp rise in all frequencies which is followed</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">by a peak in emission from higher frequency channels which moves</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">to lower frequency channels over the subsequent 10 minutes. The</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">extent of the radio source increases just before the collapse,</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">before decreasing and returning to a similar value as before the</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">collapse.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[[File:329f3.png|500px|thumb|center|Figure 3:</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">(a) Time-distance plots demonstrating the apparent plane-of-sky</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">motion of brightening in the 171 &Acirc; channel along slice A (top panel)</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">and slice B (bottom panel), which are shown in Figure 2. </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">The horizontal dotted line denotes the location of the apparent coronal</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">3D null point, and vertical dashed lines correspond to the three</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">time intervals used to produce the three panels in Figure 2. (b)</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">Timedistance plots for the 193 &Acirc; channel. Overlaid on both time-distance</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">plots are dash-dotted lines indicating approximate velocities of</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">the flow features from which they are offset. (c) NRH brightness</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">temperature, averaged over the area within a 50% contour of each</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">NRH image, for its 7 highest recorded frequencies, smoothed over 6</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">points, and normalised to clarify local peaks. (d) NRH extent,</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">measured as the linear distance between the centroid of the highest</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">and lowest frequency stable sources, which were 432 and 298 MHz,</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">respectively.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">]]</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== References ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== References ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[1] [http://adsabs.harvard.edu/abs/2018arXiv180609365O "Three-dimensional magnetic reconnection in a collapsing coronal loop system"]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[1] [http://adsabs.harvard.edu/abs/2018arXiv180609365O "Three-dimensional magnetic reconnection in a collapsing coronal loop system"]</div></td></tr>
</table>Hhudsonhttps://sprg.ssl.berkeley.edu/~tohban/wiki/index.php?title=3D_Magnetic_Reconnection_at_a_Coronal_Null_Point&diff=10473&oldid=prevHhudson: first part of No. 3302018-07-21T19:40:18Z<p>first part of No. 330</p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|title = 3D Reconnection at a Coronal Magnetic Null Point</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|title = 3D Reconnection at a Coronal Magnetic Null Point</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|number = 329</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|number = 329</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|first_author = Maloney</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|first_author = <ins class="diffchange diffchange-inline">Shane </ins>Maloney</div></td></tr>
<tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|<del class="diffchange diffchange-inline">secon_author </del>= O'Flannagain</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|<ins class="diffchange diffchange-inline">second_author </ins>= <ins class="diffchange diffchange-inline">Aidan </ins>O'Flannagain</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|publish_date = 30 July 2018</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|publish_date = 30 July 2018</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|next_nugget= TBD</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|next_nugget= TBD</div></td></tr>
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</table>Hhudsonhttps://sprg.ssl.berkeley.edu/~tohban/wiki/index.php?title=3D_Magnetic_Reconnection_at_a_Coronal_Null_Point&diff=10472&oldid=prevHhudson: Created page with "{{Infobox Nugget |name = Nugget |title = 3D Reconnection at a Coronal Magnetic Null Point |number = 329 |first_author = Maloney |secon_author = O'Flannagain |publish_date = 30 Ju..."2018-07-21T15:50:36Z<p>Created page with "{{Infobox Nugget |name = Nugget |title = 3D Reconnection at a Coronal Magnetic Null Point |number = 329 |first_author = Maloney |secon_author = O'Flannagain |publish_date = 30 Ju..."</p>
<p><b>New page</b></p><div>{{Infobox Nugget<br />
|name = Nugget<br />
|title = 3D Reconnection at a Coronal Magnetic Null Point<br />
|number = 329<br />
|first_author = Maloney<br />
|secon_author = O'Flannagain<br />
|publish_date = 30 July 2018<br />
|next_nugget= TBD<br />
|previous_nugget=[]<br />
}}<br />
<br />
== Introduction ==<br />
<br />
[https://en.wikipedia.org/wiki/Magnetic_reconnection Magnetic reconnection] <br />
is believed to be the primary mechanism by<br />
which free energy stored in coronal magnetic fields is<br />
rapidly released during solar eruptive events. <br />
Unfortunately, owing<br />
to the small spatial scales on which reconnection is thought to<br />
occur, it is not directly observable by remote sensing of the solar corona. <br />
However, larger scale processes, such as associated inflows and outflows, plus <br />
signatures of accelerated particles, have been put forward as evidence<br />
of reconnection. <br />
Magnetic reconnection is often studied at X-points, the <br />
[http://solarmuri.ssl.berkeley.edu/~hhudson/cartoons/ simplest view]<br />
of the process in two dimensions.<br />
<br />
In the case presented in this Nugget, we think instead that the reconnection <br />
occurs at a 3D coronal null point (Ref. [2]).<br />
This study employs data from many instruments:<br />
[http://aia.lmsal.com SDO/AIA],<br />
[http://hmi.stanford.edu SDO/HMK],<br />
the [https://www.obs-nancay.fr/-Radioheliographe-.html?lang=fr Nançay Radiohelioaph]<br />
and <br />
[https://www.solarmonitor.org GOES]<br />
(as well as RHESSI), in a study of the partial collapse of a coronal<br />
structure associated with a Type I radio storm <br />
([http://www.reeve.com/Documents/CALLISTO/Reeve_CallistoBurstCat_SARAWestPaper2_2013_bw.pdf .pdf]).<br />
We interpret the observations as evidence for accelerated electrons in the <br />
reconnection region responding to a gradual fall and rapid rise in electric drift velocity, <br />
in response to the inflowing and outflowing field lines at a 3D null point.<br />
<br />
== Observations ==<br />
<br />
Figure 1 shows SDO/AIA observations of the passage of an X-shaped<br />
feature from the limb towards disk centre. <br />
The X-shaped feature<br />
appears to undergo a partial collapse on 6 July 2013 at approximately<br />
09:45. Before this collapse four loop structures are visible in 171<br />
A channel while after the collapse the northern and western segments<br />
are no longer visible <br />
<br />
[[File:329f1.png|400px|thumb|center|Figure 1: <br />
Overview of the collapse of the X-shaped coronal structure. Top:<br />
AIA 171 &Acirc; images covering the 90 minutes surrounding the collapse.<br />
Overlaid on the earliest image are the slices used to generate the<br />
timedistance plots shown in Figure 3. Slices A and B are 67<br />
arcseconds and 96 arcseconds long, respectively; the arrow denotes<br />
the reference direction for the timedistance plots. Middle: Nançay Radioheliograph <br />
430 MHz images showing the Type I storm source at the times of the<br />
above images. Overlaid is the field of view of the AIA images.<br />
Bottom: GOES 1-8 &Acirc; and RHESSI 3-6 keV light curves, showing the<br />
flares that occurred during the collapse.<br />
(from [Ref. 1]).<br />
]]<br />
<br />
== References ==<br />
<br />
[1] [http://adsabs.harvard.edu/abs/2018arXiv180609365O "Three-dimensional magnetic reconnection in a collapsing coronal loop system"]</div>Hhudson