https://sprg.ssl.berkeley.edu/~tohban/wiki/index.php?title=Cycle_25_Strikes_Again&feed=atom&action=historyCycle 25 Strikes Again - Revision history2024-03-29T01:22:42ZRevision history for this page on the wikiMediaWiki 1.16.0https://sprg.ssl.berkeley.edu/~tohban/wiki/index.php?title=Cycle_25_Strikes_Again&diff=11304&oldid=prevSchriste at 20:13, 7 December 20182018-12-07T20:13:54Z<p></p>
<table style="background-color: white; color:black;">
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
<tr valign='top'>
<td colspan='2' style="background-color: white; color:black;">← Older revision</td>
<td colspan='2' style="background-color: white; color:black;">Revision as of 20:13, 7 December 2018</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 6:</td>
<td colspan="2" class="diff-lineno">Line 6:</td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|second_author = </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|second_author = </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|publish_date = 20 November 2018</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|publish_date = 20 November 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">Neutrons </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::338]]}}</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|previous_nugget={{#ask: [[Category:Nugget]] [[RHESSI Nugget Index::336]]}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|previous_nugget={{#ask: [[Category:Nugget]] [[RHESSI Nugget Index::336]]}}</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>
</table>Schristehttps://sprg.ssl.berkeley.edu/~tohban/wiki/index.php?title=Cycle_25_Strikes_Again&diff=11264&oldid=prevHhudson: Draft 3372018-11-17T18:08:14Z<p>Draft 337</p>
<p><b>New page</b></p><div>{{Infobox Nugget<br />
|name = Nugget<br />
|title = Cycle 25 Strikes Again <br />
|number = 337<br />
|first_author = Kamil Bicz<br />
|second_author = <br />
|publish_date = 20 November 2018<br />
|next_nugget = Neutrons <br />
|previous_nugget={{#ask: [[Category:Nugget]] [[RHESSI Nugget Index::336]]}}<br />
}}<br />
<br />
<br />
== Introduction ==<br />
<br />
This Nugget announces that we have seen second clear sign of <br />
[https://en.wikipedia.org/wiki/Solar_cycle_25 Cycle 25]<br />
sunspot activity. <br />
Nugget No. [http://sprg.ssl.berkeley.edu/~tohban/wiki/index.php/A_Sunspot_from_Cycle_25_for_sure 321] <br />
had described first sunspot of Cycle 25, and on November 8 (2018), at a <br />
high solar latitude, something interesting again appeared on the Sun. <br />
A tiny sunspot with Cycle 25 magnetic orientation appeared, and we believe<br />
this to be the second occurrence of the new Cycle.<br />
It persisted for about 5 days and appeared to have been bigger than its <br />
predecessor. <br />
This is interesting because it is already a second sunspot of the <br />
new cycle even before the minimum of <br />
[https://en.wikipedia.org/wiki/Solar_cycle_24 Cycle 24] <br />
has been well established.<br />
<br />
== The second Cycle 25 sunspot ==<br />
<br />
When this Nugget was written, NOAA had not identified this new<br />
sunspot with an official active-region number, and in fact it never<br />
did before solar rotation eclipsed it.<br />
We are unaware of any other public announcement, so this may be another <br />
RHESSI Nugget first!<br />
But it was duly entered in Jan Ulvestadt's <br />
[http://www.solen.info/solar/cycle25_spots.html SOLEN] list, which also<br />
noted it to be the largest Cycle 25 spot yet.<br />
The magnetic polarity of this region was unmistakeably reversed, and its <br />
appearance at high latitude strongly identifies it as a piece of the new <br />
cycle. <br />
<br />
Figure 1 here shows the sunspot on October 9, 2018 and the magnetic<br />
field polarities correlated with this sunspot. <br />
<br />
[[File:337f1.png|600px|thumb|center|Figure 1: File<br />
images from the HMI intrument on SDO: left, the telltale magnetic<br />
field; right, the continuum intensity. <br />
]]<br />
<br />
At the bottom of Figure 2 we can see a reference active region,<br />
NOAA No. 12726, which appeared a few days after region described in this <br />
Nugget. <br />
Region 12726 is part of Cycle 24 because black polarity is on the right <br />
which is opposite to polarity shown on Fig. 1. <br />
The sunspot on the continuum image can be hard to see but referring it to <br />
the location of magnetic fields can help; it's really there.<br />
<br />
[[File:337f2.png|500px|thumb|center|Figure 2: File<br />
images from the <br />
[http://hmi.stanford.edu HMI] intrument on <br />
[https://sdo.gsfc.nasa.gov SDO]. <br />
]]<br />
<br />
Sadly, nothing happened... the new region did not gave us a flare. <br />
The region simply appeared, and then the sunspot fragmented and disappeared<br />
on the disk in a few days.<br />
But it gave us hope for new regions (bigger, and with flares), hopefully <br />
in the close future.<br />
<br />
== Conclusion ==<br />
<br />
This sunspot was properly tabulated in the meticulous<br />
[http://www.solen.info/solar/ SOLEN] page of Jan Alvestad. <br />
We thank him for his diligent monitoring of solar activity<br />
As a closing thought... does this make a new <br />
[http://www.solarstorms.org/SunLikeStars.html Maunder Minimum] seem<br />
less likely?</div>Hhudson