RHESSI Science Nuggets

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Revision as of 16:29, 16 February 2013

Welcome to the RHESSI Science Nuggets: science notes from RHESSI. The following is a time-ordered list of the latest Nuggets added to the wiki. An alphabetical list of wiki Nuggets is also available. If you are looking for older Nuggets than please visit the original series of RHESSI Science Nuggets and use the search facilities there; for this new series of Nuggets in the Wiki format, use your browser's search facility for title words or authors. We welcome volunteer authors - please see our page of help for authors. Please note that each Nugget page has a Discussion page, which sometimes has really interesting information.

194 Electron re-acceleration and HXR emission
18 February 2013 by Heather Ratcliffe and Marian Karlický
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Can wave-particle interactions solve the electron number problem?. Click the title to read more.
193 Passages of Electron Beams
11 February 2013 by Bin Chen and Tim Bastian
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New VLA capability for imaging spectroscopy shows several remarkable features of type III bursts. Click the title to read more.
192 Kappa Distribution
21 January 2013 by Mitsuo Oka
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A simpler function fits both thermal and nonthermal RHESSI spectral ranges. Click the title to read more.
191 Hard X-ray Spikes Observed by RHESSI
7 January 2013 by Jiong Qiu
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New software allows RHESSI to study rapid time variations. Click the title to read more.
190 Flare Productivity
27 December 2012 by Hugh Hudson and Lyndsay Fletcher
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An anomalous change in flare productivity per active region. Click the title to read more.
189 FOXSI Success
27 December 2012 by Lindsay Glesener and Säm Krucker
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The FOXSI rocket soars, and a flare occurs on schedule. Click the title to read more.
188 "Impulse Response Flares" and Gamma Rays
13 November 2012 by Stephen White and Hugh Hudson
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A simplifying paradigm may describe acceleration to the highest energies in flares. Click the title to read more.
187 Glasgow Callisto optimistic: first light comes in focus
29 October 2012 by Heather Ratcliffe and Eduard Kontar
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The Glasgow Callisto radio observatory is on line. Click the title to read more.
186 Photospheric Temperature Gradient
22 October 2012 by Martin Fivian and Hugh Hudson
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RHESSI observes the photosphere with exquisite precision. Click the title to read more.
185 Energy Partition in Large Solar Eruptive Events
5 October 2012 by Gordon Emslie and Brian Dennis
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Where the flare energy comes from, and where it goes to.. Click the title to read more.
184 New TGFs Found in the RHESSI Data
10 September 2012 by Thomas Gjesteland and Nikolai Østgaard
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RHESSI sees many, many gamma-ray flashes from lightning. Click the title to read more.
183 The RHESSI Flare Catalog
29 August 2012 by Jim McTiernan and Hugh Hudson
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The Catalog is a powerful and easy-to-use access tool for the RHESSI flare observations. Click the title to read more.
182 RHESSI Catches Gamma-Ray Bursts
15 August 2012 by Jakub Ripa
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RHESSI catches gamma-ray bursts, and they come in three flavors. Click the title to read more.
181 Dense Loop Flares
6 August 2012 by Jingnan Guo and Gordon Emslie
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Direct electron mapping teaches us about the structure of electron acceleration in flares. Click the title to read more.
180 The Slowest Flare
23 July 2012 by Sam Freeland and Hugh Hudson
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A flare with an exceptionally slow rise phase, more than 5 hours in GOES 1-8 A soft X-rays. Click the title to read more.
179 Dimmings and Sustained Gamma-Ray Events
25 June 2012 by Hugh Hudson and Nicola Omodei
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Coronal disruptions reveal themselves as depletions and gamma-ray emissions. Click the title to read more.
178 Flare Nimbus
14 June 2012 by Susan McKenna-Lawlor
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The Flare Nimbus, its history and significance. Click the title to read more.
177 RHESSI and the Transit of Venus I
1 June 2012 by Hugh Hudson and Martin Fivian
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RHESSI prepares for the June 5/6 Venus transit. Click the title to read more.
176 Time Profiles of Solar Flare Densities
21 May 2012 by Ryan Milligan and Michael Kennedy
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Density-diagnostic line ratios in EVE spectra. Click the title to read more.
175 Solar energetic electron events over one solar cycle
7 May 2012 by Linghua Wang
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The statistics of SEP electrons. Click the title to read more.
174 A Shocking Type II
30 April 2012 by Hazel Bain, Säm Krucker and Lyndsay Glesener
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The properties of global coronal waves sorted out. Click the title to read more.
173 RHESSI and IRIS
16 April 2012 by Hugh Hudson
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Flare gold at the foot of the rainbow. Click the title to read more.
172 A New Day Dawns
26 March 2012 by Dale Gary
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Soon, true microwave imaging spectroscopy. Click the title to read more.
171 An Fe Cascade
12 March 2012 by Hugh Hudson
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Iron everywhere in the EVE spectra. Click the title to read more.
170 Do slow waves trigger pulsations in two-ribbon flares? An observational search‎
27 February 2012 by A. Inglis and B. Dennis
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Slow waves, QPPs, and hard X-rays. Click the title to read more.
169 RHESSI's Tenth Anniversary
15 February 2012 by B. Dennis and R. Lin
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On RHESSI's tenth, a top-ten discovery list. Click the title to read more.
168 Supra-Arcade Downflows
23 January 2012 by S. Savage and D. McKenzie
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A re-interpretation of the famous SAD tadpoles. Click the title to read more.
167 Flare Observations of the EUV Continua
16 January 2012 by R. Milligan
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The flare EUV continua now routinely observed. Click the title to read more.
166 No Hard X-rays from Comet Lovejoy
19 December 2011 by H. Hudson and P. Saint-Hilaire
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An amazing sungrazing comet, but not detectable at high energies. Click the title to read more.
165 Modelling spatially resolved X-ray polarization
12 December 2011 by N. Jeffrey and E. Kontar
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Spatial distribution of X-ray polarization, and its implications. Click the title to read more.
164 Slowly but surely towards the huge amount of energy II
28 November 2011 by S. Kołomański and T. Mrozek
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Analysis of the huge energies of loop-top sources in flares. Click the title to read more.
163 X-ray and H-alpha Flare Impulses
14 November 2011 by K. Radziszewski and P. Rudawy
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Strikingly precise correlations of H-alpha kernels and hard X-ray bursts. Click the title to read more.
162 Slowly but surely towards the huge amount of energy I
31 October 2011 by Urszula Bąk-Stęślicka and Tomasz Mrozek, Sylwester Kołomański
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The energetics of "slow LDEs". Click the title to read more.
161 Quasi-Periodic Pulsations: Fermi/GBM Results
24 October 2011 by David Gruber and Pawel Lachowicz
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Dealing with red noise. Click the title to read more.
160 A Flare in 3D
10 October 2011 by Hugh Hudson and Juan Carlos Martinez Oliveros
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Solar astrometry in 3D. Click the title to read more.
159 Solar Max Arrives
28 September 2011 by Hugh Hudson and Richard Schwartz
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Seven X-class flares already in 2011. Click the title to read more.
158 Two-stage SEE Shows Reconnection
8 September 2011 by Yang Su and Brian Dennis
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Reconnection late in a flare. Click the title to read more.
157 Scattered Light: Inverse Compton Scattering and Coronal Hard X-ray Sources
17 August 2011 by B. Chen and T. S. Bastian
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Inverse Compton radiation - gaining momentum. Click the title to read more.
156 X-ray, EUV & WL emission heights observed by RHESSI & SDO
24 July 2011 by Marina Battaglia and Eduard Kontar
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A first - the relative height of hard X-ray and white-light flare sources. Click the title to read more.
155 Hard X-rays and Sympathy
13 July 2011 by Hugh Hudson
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A hard X-ray spike elicits a sympathetic response. Click the title to read more.
154 Suzaku Microflares
30 June 2011 by S. Ishikawa
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Microflares too have powerful particle acceleration. Click the title to read more.
153 Acceleration without Heating
13 June 2011 by G. Fleishman & E. Kontar
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Strong hard X-rays and weak soft X-rays - breaking the paradigm?. Click the title to read more.
152 DIY spectroscopy: Analyzing AIA diffraction patterns
30 May 2011 by C. L. Raftery & S. Krucker
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Imaging spectroscopy in the EUV, at AIA resolution. Click the title to read more.
151 EVE/ESP and the Neupert Effect
9 May 2011 by H. Hudson
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The Neupert Effect works, sort of, in a limb gamma-ray flare. Click the title to read more.
150 Decimetric pulsations and coronal X-ray sources
18 April 2011 by A. Benz, M. Battaglia, and N. Vilmer
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Radio pulsations may illuminate a strongly non-radial current sheet. Click the title to read more.
149 The Alfven Speed above a Sunspot, and Gamma-rays
12 April 2011 by H. Hudson and L. Fletcher
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Flare effects in sunspot umbrae. Click the title to read more.

{

148 Slow Magnetoacoustic Waves in Two-Ribbon Flares
17 March 2011 by V. Nakariakov and I. Zimovets
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Wave dynamics explains arcade development. Click the title to read more.
147 First Sunquake of Solar Cycle 24 Observed by Solar Dynamics Observatory
7 March 2011 by A. G. Kosovichev
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An X-class flare - and a sunquake. Click the title to read more.
146 M is for Magnifique Part Deux
22 February 2011 by Steven Christe and Andrew Inglis
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A type II radio burst but no CME and introducing a new way to search for waves in SDO. (CORRECTION There is a CME!). Click the title to read more.
145 At last, the EUV Spectrum
8 February 2011 by Hugh Hudson
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The main flare radiated energy is not in the EUV. Click the title to read more.
144 Black and White Flares
24 January 2011 by Juan Carlos Martinez Oliveros and Charles Lindsey
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HMI sees a black-light flare (?). Click the title to read more.
143 The Flares of the RHESSI Monograph
11 January 2011 by Hugh Hudson and Gordon Emslie
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The top ten RHESSI flares thus far. Click the title to read more.
142 Brilliant Timing
20 December 2010 by Säm Krucker and Hugh Hudson
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Hinode and RHESSI observations strain the credibility of the thick-target model. Click the title to read more.
141 M is for Magnifique
6 December 2010 by Steven Christe and Andrew Inglis
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RHESSI and SDO see a remarkable flare. Click the title to read more.
140 Major Flare Watch Evaluation
15 November 2010 by Dick Canfield and Shaun Bloomfield
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How well the Chief Observers do. Click the title to read more.
139 But there was a bigger one
8 November 2010 by Hugh Hudson and Lindsay Glesener
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A cycle 24 coronal hard X-ray event. Click the title to read more.
138 SDO EVE Flare Observation
18 October 2010 by Phil Chamberlin and Tom Woods
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Introducing EVE spectroscopy of flares. Click the title to read more.
137 Sector Boundaries and RHESSI Flares
4 October 2010 by Leif Svalgaard and Iain Hannah
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The interplanetary magnetic sectors seen in RHESSI flare statistics. Click the title to read more.
136 Quiet Sun III
27 September 2010 by Iain Hannah and Hugh Hudson
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The quiet Sun can be an X-ray source. Click the title to read more.
135 The X-ray Limb
6 September 2010 by Hugh Hudson and Gordon Hurford
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RHESSI gets to determine RSun. Click the title to read more.
134 Fast electrons relaxing
23 August 2010 by Alec MacKinnon
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What do electrons do to relax?. Click the title to read more.
133 Chromospheric Plasma Parameters
2 August 2010 by Stephanie Chow and Hugh Hudson
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Semi-empirical models of the chromosphere and plasma physics. Click the title to read more.
132 Harmonic Oscillations
12 July 2010 by Ivan Zimovets and Andrew Inglis
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RHESSI rotation and nutation are necessary, but may complicate time-series analysis. Click the title to read more.
131 Cloudy SolarSoftware
5 July 2010 by Laszlo Etesi and Brian Dennis
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The Cloud helps with access to data in the Virtual Solar Observatory. Click the title to read more.
130 Albedo and the modification of RHESSI results
28 June 2010 by Natasha Jeffrey and Eduard Kontar
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Compton-scattering albedo sources have significant observational consequences. Click the title to read more.
129 Kernels and Ribbons
14 June 2010 by Jiong QIU
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A clue to the differences between footpoints and ribbons. Click the title to read more.
128 Awesome Stellar Flare Spectra
2 June 2010 by Adam Kowalski and Suzanne Hawley
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Can spectra of stellar flares be compared with images of solar flares?. Click the title to read more.
127 RHESSI's Anneal Adventure
14 May 2010 by David Smith and Mark Lewis
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An operations anomaly leads to very successful improvements in RHESSI's performance. Click the title to read more.
126 History of Solar Oblateness
26 April 2010 by Hugh Hudson and Jean-Pierre Rozelot
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RHESSI is contributing to an historically interesting and fundamental measurement. Click the title to read more.
125 An Alternative View of the Masuda Flare
12 April 2010 by Nariaki Nitta
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Large-scale coronal structures may have played a major role in the Masuda flare. Click the title to read more.
124 Particle Acceleration due to a Plasmoid-Looptop Collision
29 March 2010 by Ryan Milligan
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Evidence that downward plasma motions during a flare result in particle acceleration. Click the title to read more.
123 Waiting Times of Solar Hard X-Ray Flares
15 March 2010 by Markus Aschwanden and Jim McTiernan
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Waiting times, sandpiles, and solar flares. Click the title to read more.
122 Narrowband radio signal correlated with early hard X-ray flux during a microflare
1 March 2010 by Henry Aurass
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RHESSI hard X-ray bursts with orthogonal radio signatures. Click the title to read more.
121 Revisiting the SHH and SEP Link
15 February 2010 by James Grayson and Säm Krucker
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RHESSI confirms the statistical link between flare hard X-ray spectral evolution and the acceleration of solar energetic particles. Click the title to read more.
120 Two phases of X-ray emission in a solar eruptive flare
1 February 2010 by Bhuwan Joshi
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Can the RHESSI early phase of a flare be squeezed into the Rainbow Reconnection Model?. Click the title to read more.
119 Solar Hard X-ray Albedo
18 January 2010 by Ed Schmahl and Gordon Hurford
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The elusive hard X-ray albedo source directly imaged at last!. Click the title to read more.
118 Cycle 24 has begun
5 January 2010 by Hugh Hudson and Greg Slater
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Activity has increased sufficiently to state that we have left the doldrums at last.. Click the title to read more.
117 Relative and (maybe) Absolute RHESSI Detector Efficiency: 2002-2008
22 December 2009 by Jim McTiernan
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The thousands of flares observed by RHESSI are used to intercalibrate its nine detectors, and we also use the standard GOES soft X-ray data as an external reference. Click the title to read more.
116 A tiny white-light flare‎
7 December 2009 by Hugh Hudson
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A faint white-light flare serves as a model for the continuous energy distribution of the impulsive phase. Click the title to read more.
115 Dips and Waves
23 November 2009 by Iain Hannah and Eduard Kontar
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The inclusion of wave-particle interactions appears to have a drastic effect on the classical thick-target model for flare hard X-ray emission.. Click the title to read more.
114 STEREO observations of flares and their associations with CMEs
10 November 2009 by Nariaki Nitta
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Is it possible to distinguish flares associated with major CMEs from those not associated with them, on the basis of hard X-ray images?. Click the title to read more.
113 Imaging through visibility interpolation: uv-smooth
23 October 2009 by A. M. Massone, M. Piana and A. G. Emslie
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RHESSI visibilities allow incredibly fast and robust imaging of solar flares. Read this nugget and you'll learn how.. Click the title to read more.
112 A Bad Time for Flares but a Good Time for Debris
12 October 2009 by W. Dean Pesnell
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Orbital debris - dangerous to satellites in low Earth orbit - has been increasing recently. There are solar and non-solar reasons for this.. Click the title to read more.
111 RHESSI Deep Integrations
29 September 2009 by Pascal Saint-Hilaire
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With an extremely deep integration, RHESSI may have detected X-rays from the base of a post-CME current sheet.. Click the title to read more.
110 RHESSI in Cycle 24
14 September 2009 by Säm Krucker and Hugh Hudson
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RHESSI has successfully imaged one of the first flares of Cycle 24 in hard X-rays. Click the title to read more.
109 Confined Flares versus Eruptive Flares
31 August 2009 by Jie Zhang
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Eruptions tend not to happen for events that occur deep within an active region. Click the title to read more.
108 Solar Cosmic Rays of the GLE on 20 January 2005
24 August 2009 by Sophie Masson & Ludwig Klein
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The relativistic solar protons of this event are related to an extended impulsive phase in the low corona. Click the title to read more.
107 CMEless Flares
12 August 2009 by Hugh Hudson & Säm Krucker
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Major flares without CMEs have distinguishing X-ray properties. Click the title to read more.
106 Where are the flares
21 July 2009 by Hugh Hudson & Leif Svalgaard
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The rise to maximum of Cycle 24 is much weaker, in terms of flare occurrence, than Cycle 23.. Click the title to read more.
105 The 15.11 MeV Gamma-ray Line Detected?
6 July 2009 by Brian Dennis
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Carol Crannell's favorite gamma-ray line may have been detected at last. Click the title to read more.
104 Do solar decimetric spikes originate in coronal X-ray sources?
22 June 2009 by Arnold Benz & Marina Battaglia
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A surprise: radio and hard X-ray positions do not agree. Click the title to read more.
103 STEREO observed stealth CME
8 June 2009 by Eva Robbrecht
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Spectacular coronal effects with no chromospheric counterpart. Click the title to read more.
102 Hard X-ray Pulsations in Flares
25 May 2009 by Andrew Inglis & Valery Nakariakov
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"Coronal seismology" via hard X-rays and microwaves. Click the title to read more.
101 RHESSI microflares - Flare Cartoons and Reality
11 May 2009 by Sigrid Berkebile-Stoiser
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Do the standard cartoon models of solar flares describe the microflares as well?. Click the title to read more.
100 RHESSI - Concept to Fruition
29 April 2009 by Brian Dennis & Bob Lin
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A brief history of RHESSI.. Click the title to read more.
99 Cycle 24 - don't panic yet!
13 April 2009 by Leif Svalgaard and Hugh Hudson
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Cycle 24 is definitely late in arriving, and it's interesting, but this probably has happened before.. Click the title to read more.
98 Chree Analysis for Flares
30 March 2009 by Hugh Hudson
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Exploring Chree analysis as applied to total solar irradiance measurements of flares.. Click the title to read more.
97 High Temperatures in Active Regions
16 March 2009 by Jim McTiernan
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RHESSI discovers high temperatures, well above those of the corona, in quiescent active regions.. Click the title to read more.
96 The Jakimiec Track
2 March 2009 by Hugh Hudson and Fabio Reale
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A recent re-analysis of the relationship between emission measure and temperature in flares stimulates this new nugget.. Click the title to read more.
95 Coronal implosion
16 February 2009 by Rui Liu
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Though we expect flare implosions, we frequently observe explosions (i.e. eruptions). In this nugget, an observation of a contracting flare is described and analyzed.. Click the title to read more.
94 Other Discoveries from Carrington's Flare
2 February 2009 by Hugh Hudson
link=Other Discoveries from Carrington%27s Flare
During the sesquicentennial of the Carrington flare, let us not forget how "Space Weather" got its start.. Click the title to read more.
93 Collapsing Traps
21 January 2009 by Boris Somov and Hugh Hudson
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Large-scale plasma motions, as in magnetic reconnection, can directly accelerate high-energy particles.. Click the title to read more.
92 RHESSI Simulations of Complicated Flares
5 January 2009 by Lyndsay Fletcher and Jim McTiernan
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Comparing RHESSI images with ones simulated from TRACE "white light" reveals striking similarities but intriguing differences.. Click the title to read more.
91 Cycle 24
22 December 2008 by Hugh Hudson and Steven Christe
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Solar cycle 24 seems to be delayed. Where are the spots? This Nugget discusses the problem and reviews the recent Solar24 meeting, the first in our field to be Wikified.. Click the title to read more.
90 Inverse Compton X-rays from relativistic flare leptons
1 December 2008 by Alec MacKinnon and Procheta Mallik
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Compton scattering makes the Sun visible at high energies, via processes related to the galactic cosmic rays. This is not your ordinary Bremsstrahlung.... Click the title to read more.
89 The Rise and Fall of The Low Energy Cut Off
17 November 2008 by Ewan Dickson and Eduard Kontar
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Solar hard X-rays tend to have a power-law distribution in energy, implying infinite photon numbers at low energy (a "soft X-ray catastrophe"). Can we observe what limits this behavior?. Click the title to read more.
88 SEPs Link not Confirmed
3 November 2008 by Gerry Share and Allan Tylka
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The spectral evolution of a solar hard X-ray burst may give a clue to the acceleration of solar energetic particles (SEPs). This RHESSI Science Nugget questions the validity of this predictor.. Click the title to read more.
87 The SphinX Instrument on CORONAS-PHOTON
22 October 2008 by Janusz Sylwester and Ken Phillips
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An exciting new instrument will begin observations at an exciting time.. Click the title to read more.
86 The Good Guys and the Rascals
13 October 2008 by B. Dabrowski and Arnold Benz
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Solar decimetric radio bursts - but only the good guys - correlate well with RHESSI hard X-rays.. Click the title to read more.
85 RHESSI Optical Images
2008-09-29 by H. Jabran Zahid and Hugh Hudson
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RHESSI makes optical images as well as X-ray and gamma-ray ones. This Nugget explains how.. Click the title to read more.
84 Flare Plasma Abundances - New X-ray Observations
2008-09-15 by Brian Dennis and Richard Starr
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MESSENGER is now exploring Mercury. It is also helping RHESSI to understand the solar X-ray spectrum and measure elemental abundances in flares.. Click the title to read more.
83 [[Hard X-rays from a Jet?]]
2008-08-27 by Hazel Miller Bain and Lyndsay Fletcher
link=Hard X-rays from a Jet?
Observations during the rise phase of a M5.4 flare suggests that hard x-rays may be associated with a jet observed by TRACE.. Click the title to read more.
82 [[Are Stellar Flares like Solar Flares?]]
2008-08-11 by Hugh Hudson and Beate Stelzer
link=Are Stellar Flares like Solar Flares?
In this Nugget, we explore an extrasolar flare (aka stellar flare). These stellar and solar flares are similar but it is often in subtle differences that we may learn the most.. Click the title to read more.
81 [[The Microflare Height Distribution]]
2008-07-28 by Steven Christe and Hugh Hudson
link=The Microflare Height Distribution
Another look at microflare positions.... Click the title to read more.
80 [[The McClymont Jerk]]
2008-07-14 by Hugh Hudson and Brian Welsch
link=The McClymont Jerk
The sudden energy release of a flare in the solar atmosphere has many consequences. One of them may be the McClymont Jerk.. Click the title to read more.

For all previous Nuggets go to the old RHESSI Science Nugget Page.

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