RHESSI Science Nuggets
From RHESSI Wiki
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.
307 | The Kelvin Force and Loop-top Concentration | |
18 September 2017 by Kiyoto SHIBASAKI | ||
New physics can explain the perplexing overpressure at the flare looptop regions. Click the title to read more. | ||
---|---|---|
306 | The Last Best Flare of Cycle 24 ..?. | |
11 September 2017 by Säm Krucker and Hugh Hudson | ||
Right on schedule, Cycle 24 has produced a great flare. Click the title to read more. | ||
---|---|---|
305 | Electric Current Neutralization and Solar Eruption in Active Regions | |
28 August 2017 by Yang LIU | ||
Active current systems in the solar corona don't have return currents. Click the title to read more. | ||
---|---|---|
304 | RHESSI and the Megamovie | |
31 July 2017 by Hugh Hudson, Laura Peticolas, and Juan Carlos Martínez Oliveros | ||
A wholly new way to view a solar eclipse, and to do solar astrometry. Click the title to read more. | ||
---|---|---|
303 | Bastille Day 2017 | |
24 July 2017 by Hugh Hudson and Säm Krucker | ||
Interesting flares really do happen on Bastille Day.... Click the title to read more. | ||
---|---|---|
302 | The Solar X-ray Limb III | |
12 June 2017 by Marina Battaglia and Gordon Hurford | ||
RHESSI succeeds with a wholly new way to measure the solar diameter. Click the title to read more. | ||
---|---|---|
301 | Double Coronal X-ray and Microwave Sources Associated With A Magnetic Breakout Solar Eruption | |
29 May 2017 by Yao CHEN | ||
A different explanation of the double coronal hard X-ray sources. Click the title to read more. | ||
---|---|---|
300 | A Lasso Model for Solar Gamma-ray Events | |
15 May 2017 by Hugh Hudson | ||
A toy model hoping to explain the SEP/LAT relationship. Click the title to read more. | ||
---|---|---|
299 | High Resolution Temporal and Spatial Structure of a White Light Flare | |
30 April 2017 by Vasyl Yurchyshyn | ||
The biggest solar telescope finds still smaller scales for white-light flaring - and more. Click the title to read more. | ||
---|---|---|
298 | Multi-Instrument Solar Flare Observations II: A SC24 retrospective | |
10 April 2017 by Ryan Milligan and Jack Ireland | ||
Retrospective searches for other useful observations of your favorite flare - how the widget did in Cycle 24. Click the title to read more. | ||
---|---|---|
297 | Multi-Instrument Solar Flare Observations I: Solar Flare Finder | |
3 April 2017 by Ryan Milligan and Kim Tolbert | ||
Retrospective searches for other useful observations of your favorite flare. Click the title to read more. | ||
---|---|---|
296 | Suppression of Hydrogen Emission in an X-class White-light Solar Flare | |
20 March 2017 by Ondřej Procházka and Ryan Milligan | ||
The absence of hydrogen emission lines in a white-light flare suggests an origin in the deep solar atmosphere.. Click the title to read more. | ||
---|---|---|
295 | Radio Emissions from Double RHESSI TGFs | |
13 March 2017 by Andrey Mezentsev and Thomas Gjesteland | ||
Lightning helps with microsecond timing calibrations, and is really interesting as a phenomenon of high-energy astrophysics.. Click the title to read more. | ||
---|---|---|
294 | Edward Chupp | |
6 March 2017 by RHESSI | ||
. Click the title to read more. | ||
---|---|---|
293 | Pierre Kaufmann | |
19 February 2017 by RHESSI | ||
. Click the title to read more. | ||
---|---|---|
292 | RHESSI's 15th Anniversary | |
13 February 2017 by Brian Dennis, Säm Krucker and Albert Shih | ||
RHESSI celebrates 15 years in orbit. Click the title to read more. | ||
---|---|---|
291 | Hard X-ray Emission from Partially Occulted Solar Flares | |
30 January 2017 by Frederic Effenberger and Fatima Rubio da Costa | ||
Systematic use of occultation lets us observe the corona in hard X-rays. Click the title to read more. | ||
---|---|---|
290 | GOES Hard X-rays? | |
16 January 2017 by Hugh Hudson, Janet Machol, and Rodney Viereck | ||
Solar minimum conditions reveal interesting properties of the GOES X-ray observations. Click the title to read more. | ||
---|---|---|
289 | Syrovatskii's "constant density" approximation | |
30 December 2016 by Hugh Hudson and Paulo Simões | ||
Remembering S.I. Syrovatskii; the relevance of the Shmeleva-Syrovatskii “constant density” approximation has been verified by modern high-resolution observations. Click the title to read more. | ||
---|---|---|
288 | Statistical Link Between Electrons Emitting X-rays and Type III Radio Bursts | |
19 December 2016 by Hamish Reid and Nicole Vilmer | ||
Correlations across the radio and X-ray spectra imply related populations of source electrons. Click the title to read more. | ||
---|---|---|
287 | KW-Sun: The Konus/WIND Hard X-ray Solar Flare Database | |
20 November 2016 by Alexandra Lysenko and the Konus/WIND Team | ||
A Hale Cycle's worth of hard X-ray and soft gamma-ray flare observations. Click the title to read more. | ||
---|---|---|
286 | Microwave Emission from Twisted Magnetic Fields | |
13 November 2016 by Mykola Gordovskyy and Philippa Browning | ||
The inherent magnetic twist of a flaring loop can be inferred from microwave polarization signatures.. Click the title to read more. | ||
---|---|---|
285 | Spatio-Temporal Dynamics of Flare Hard X-ray Pulsations | |
31 October 2016 by Ivan Zimovets, Sergey Kuznetsov, Alexander Morgachev, and Alexei Struminsky | ||
In pulsating flare energy release, the hard X-ray source peaks have different locations.. Click the title to read more. | ||
---|---|---|
284 | Flare-induced Impulsive Sunspot Rotation caught in High Resolution | |
24 October 2016 by Chang Liu and Haimin Wang | ||
The tail wags the dog - short time scales for coronal stresses on sunspot structure. Click the title to read more. | ||
---|---|---|
283 | Hard X-ray Polarimetry from Tian Gong 2 | |
20 October 2016 by Wojtek Hajdas | ||
A novel hard X-ray polarimeter achieves solar "first light". Click the title to read more. | ||
---|---|---|
282 | A flare in the deep solar atmosphere | |
26 September 2016 by Richard Schwartz and Hugh Hudson | ||
RHESSI recently spotted a very fast, very compact, and hot flare event in the deep atmosphere. Click the title to read more. | ||
---|---|---|
281 | To be or not to be - the role of projection effects in EUV imaging | |
16 August 2016 by Karin Dissauer and Manuela Temmer | ||
Perspective matters - application of STEREO views to coronal dimming. Click the title to read more. | ||
---|---|---|
280 | Solar flare neutrons observed on the ground and in space | |
12 August 2016 by Alexander MacKinnon | ||
There has been dramatic progress in studying the Sun via its emission of energetic neutrons. Click the title to read more. | ||
---|---|---|
279 | Unexpected intensity distributions of solar electrons in the heliosphere | |
13 July 2016 by Andreas Klassen and the SEPT/STEREO team | ||
Solar energetic electrons may have complicated and informative distributions in the interplanetary medium. Click the title to read more. | ||
---|---|---|
278 | Initiation of a type II radio burst without a CME | |
4 July 2016 by Pankaj Kumar, Davina Innes, and Kyung-Suk Cho | ||
A global coronal shock wave without a CME driver. Click the title to read more. | ||
---|---|---|
277 | Spotlessness returns | |
27 June 2016 by Hugh Hudson | ||
The Sun had no spots for extended periods in June, 2016. Click the title to read more. | ||
---|---|---|
276 | RHESSI has resumed operations | |
20 June 2016 by Albert Shih, Brian Dennis and Säm Krucker | ||
A successful anneal and RHESSI continues to provide data. Click the title to read more. | ||
---|---|---|
275 | Non-thermal recombination in solar flares and microflares | |
6 June 2016 by Jeffrey Reep and John Brown | ||
A heretofore unrecognized emission mechanism for solar hard X-rays. Click the title to read more. | ||
---|---|---|
274 | Data-driven radiative hydrodynamic modeling of SOL2014-03-29 | |
10 May 2016 by Fatima Rubio da Costa | ||
Intense pulses of energy modeled with RADYN. Click the title to read more. | ||
---|---|---|
273 | Electron acceleration and hard X-ray emission from SOL2013-11-09 | |
5 May 2016 by Yuri Tsap and Galina Motorina | ||
Testing the thick-target model in an interesting flare. Click the title to read more. | ||
---|---|---|
272 | Extreme events, stellar evolution, and magnetic reconnection | |
30 April 2016 by Hugh Hudson | ||
Stellar activity measured by flare rates over the eons. Click the title to read more. | ||
---|---|---|
271 | Radio polarization signatures in twisted flare loops | |
25 April 2016 by Ivan Sharykin and Alexei Kuznetsov | ||
Flux-rope geometry via radio polarization signs. Click the title to read more. | ||
---|---|---|
270 | An Unreported White-light Prominence | |
28 March 2016 by Matt Penn and Hugh Hudson | ||
Massive flare ejecta observed visually. Click the title to read more. | ||
---|---|---|
269 | RHESSI's 5th Anneal | |
23 February 2016 by Albert Shih and Brian Dennis | ||
RHESSI has begun annealing its detectors, interrupting the flow of data for several weeks. Click the title to read more. | ||
---|---|---|
268 | A new development in the Frost-Dennis paradigm | |
22 February 2016 by Hugh Hudson, Melissa Pesce-Rollins, and Larisa Kashapova | ||
The Fermi/LAT long-duration events look like SOL1969-03-30. Click the title to read more. | ||
---|---|---|
267 | When the Earth’s atmosphere becomes dynamic… | |
13 February 2016 by Manuela Temmer, Sandro Krauss and Astrid Veronig | ||
The Earth's ionosphere reacts strongly to the occurrence of flares and CMEs. Click the title to read more. | ||
---|---|---|
266 | Hard X-ray Directivity Measurements with STIX and MiSolFA | |
7 December 2015 by Diego Casadei and Hugh Hudson | ||
Precise stereoscopic observations of hard X-rays can reveal electron beams. Click the title to read more. | ||
---|---|---|
265 | On the Correlation of HXR and WL Emission in Solar Flares | |
19 November 2015 by Matej Kuhar | ||
New data sharpen the correlations between hard X-rays and white light, but interesting questions remain open. Click the title to read more. | ||
---|---|---|
264 | How to better determine the power in non-thermal electrons from observed X-ray spectra | |
9 November 2015 by Eduard Kontar, Gordon Emslie, Natasha Jeffrey, and Nic Bian | ||
Incorporation of energy diffusion for electron transport helps with flare energetics. Click the title to read more. | ||
---|---|---|
263 | Soft and Hard X-rays, Flares, and the Corona | |
20 October 2015 by Hugh Hudson | ||
Behavior of the X-ray Sun at low activity levels. Click the title to read more. | ||
---|---|---|
262 | Fine Structure in Flare Soft X-ray Light Curves | |
21 September 2015 by Brian Dennis and Kim Tolbert | ||
A tool that we've had since 1976 now gives us surprisingly precise new information. Click the title to read more. | ||
---|---|---|
261 | Photospheric Electric Fields and Energy Fluxes in the Eruptive Active Region NOAA 11158 | |
14 September 2015 by Maria Kazachenko | ||
Flares need magnetic energy. We can now measure its arrival as Poynting flux across the solar photosphere.. Click the title to read more. | ||
---|---|---|
260 | RHESSI and General Relativity | |
7 September 2015 by Bill Thompson and Hugh Hudson | ||
General-relativistic corrections to RHESSI source positions. Click the title to read more. | ||
---|---|---|
259 | Return-current Model Spectra and Enhanced Plasma Resistivity | |
31 August 2015 by Meriem Alaoui and Gordon Holman | ||
A basic return-current model matches RHESSI hard X-ray spectra and implies a need for anomalous resistivity. Click the title to read more. | ||
---|---|---|
258 | High Energies in the Inner Heliosphere | |
24 August 2015 by Hugh Hudson | ||
Cosmic rays measure the coronal magnetic field at the PFSS source surface itself. Click the title to read more. | ||
---|---|---|
257 | A Two-ribbon White-light Flare Associated with a Failed Solar Eruption | |
13 July 2015 by Xin CHENG | ||
The ONSET facility in Yunnan observes an interesting flare event. Click the title to read more. | ||
---|---|---|
256 | The Fastest Flare | |
29 June 2015 by Hugh Hudson and Paulo Simões | ||
A GOES soft X-ray burst lasting less than one minute - with hard X-rays and white-light continuum. Click the title to read more. | ||
---|---|---|
255 | High-energy Electrons and Electric Currents during a Flare | |
22 June 2015 by Sophie Musset, Nicole Vilmer and Véronique Bommier | ||
Photospheric vertical currents linked to sites of electron acceleration in the corona. Click the title to read more. | ||
---|---|---|
254 | High Dispersion Spectroscopy of solar-type superflare stars | |
8 June 2015 by Yuta Notsu | ||
Researching the properties of Kepler's solar-type superflare stars. Click the title to read more. | ||
---|---|---|
253 | "Superflares" on solar-type stars observed with Kepler | |
1 June 2015 by Hiroyuki Maehara | ||
Flare energies 10-1000 times those of the most powerful solar flares. Click the title to read more. | ||
---|---|---|
252 | EOVSA Coverage of a Recent Gamma-Ray Flare | |
11 May 2015 by Dale Gary and Gregory Fleishman | ||
A recent gamma-ray flare observed with Owens Valley microwave imaging spectroscopy. Click the title to read more. | ||
---|---|---|
251 | Ionospheric Effects, Flare History, and Dick Donnelly | |
27 April 2015 by Hugh Hudson and Peter Gallagher | ||
Recognizing the world’s largest X-ray detector, its ionosphere. Click the title to read more. | ||
---|---|---|
250 | RHESSI Detection of X-ray Emission from a Quiet-Sun Filament Eruption | |
13 April 2015 by Gordon Holman and Adi Foord | ||
A RHESSI X-ray flare is detected outside an active region. Click the title to read more. | ||
---|---|---|
249 | Soft X-ray emission in kink-unstable coronal loops | |
30 March 2015 by Rui Pinto, Nicole Vilmer, and Sacha Brun | ||
Kinking flux ropes can create flare emission, but their detection may be deceptive. Click the title to read more. | ||
---|---|---|
248 | Daily solar mm-observations at Aalto University Metsähovi Radio Observatory | |
16 March 2015 by Juha Kallunki and Minttu Uunila | ||
Systematic microwave and mm-wave solar observations from Finland. Click the title to read more. | ||
---|---|---|
247 | Solar Physics during the March 2015 Solar Eclipse | |
9 March 2015 by Hamish Reid and Hugh Hudson | ||
A total solar eclipse is coming on 2015 March 20, a good opportunity for many observatories. Click the title to read more. | ||
---|---|---|
246 | Glasgow Callisto and CMEless type II bursts | |
16 February 2015 by Peter Wakeford and Hugh Hudson | ||
The Glasgow Callisto telescope observes rare type II bursts without CME drivers. Click the title to read more. | ||
---|---|---|
245 | Flare Heating by Mildly Non-thermal Particles | |
26 January 2015 by Jeffrey Reep | ||
Sorting out nonthermal distributions via HYDRAD models. Click the title to read more. | ||
---|---|---|
244 | Above-the-Looptop Sources | |
12 January 2015 by Mitsuo Oka and Säm Krucker | ||
Electron distribution functions in coronal sources. Click the title to read more. | ||
---|---|---|
243 | The IAU Solar Target Identifier - A Good Thing | |
29 December 2014 by Hugh Hudson and John Leibacher | ||
Standardized names for flares help a lot. Click the title to read more. | ||
---|---|---|
242 | The Low-High-Low Starting Frequency Trend in Groups of Type III Bursts | |
23 December 2014 by Hamish Reid | ||
The type III radio bursts echo the pattern of flare energy release. Click the title to read more. | ||
---|---|---|
241 | The Solar X-ray Limb II | |
24 November 2014 by Marina Battaglia and Hugh Hudson | ||
X-raying the mass distribution at the limb of the Sun: the true solar radius. Click the title to read more. | ||
---|---|---|
240 | Back from the Far Side | |
17 November 2014 by Hugh Hudson and Greg Slater | ||
Active region 2192 has returned as 2209, still no CMEs. Click the title to read more. | ||
---|---|---|
239 | A Record-Setting CMEless Flare | |
27 October 2014 by Sam Freeland and Greg Slater | ||
Active region 2192 produced many huge flares, but no CMEs. Click the title to read more. | ||
---|---|---|
238 | The Formation of Kappa Distributions in Solar Flares | |
13 October 2014 by Nicolas Bian and Duncan Stackhouse | ||
Kappa distributions may form naturally in certain flare environments. Click the title to read more. | ||
---|---|---|
237 | The Balmer continuum observed from IRIS! | |
29 September 2014 by Petr Heinzel and Lucia Kleint | ||
For the first time we have clear and direct observations of the Balmer continuum, from space. Click the title to read more. | ||
---|---|---|
236 | Energy goes up... but doesn't come back down! Coronal heating? | |
22 September 2014 by Brian Welsch | ||
The Poynting flux responsible for coronal heating may have been spotted. Click the title to read more. | ||
---|---|---|
235 | Which detectors can I use to analyze this flare? | |
15 September 2014 by Brian Dennis and Kim Tolbert | ||
A new Browser feature helps to answer this question. Click the title to read more. | ||
---|---|---|
234 | RHESSI Resumes Observations | |
1 September 2014 by Albert Shih and Säm Krucker | ||
Back to normal, the anneal was a success. Click the title to read more. | ||
---|---|---|
233 | EUNIS Sees Pervasive Faint Fe XIX Emission: Evidence for Nanoflare Heating | |
18 August 2014 by Jeff Brosius | ||
Faint emission at flare-like temperatures in a large coronal area. Click the title to read more. | ||
---|---|---|
232 | Octupolar out-of-plane magnetic field structure generation during magnetic reconnection | |
11 August 2014 by Jan Graf von der Pahlen and David Tsiklauri | ||
A new characteristic marker of reconnection. Click the title to read more. | ||
---|---|---|
231 | Flare Observed by a Dozen Instruments | |
28 July 2014 by Lucia Kleint and Kevin Reardon | ||
A wonderful flare observed by a grand set of instruments, including IRIS and IBIS. Click the title to read more. | ||
---|---|---|
230 | The Redistribution of Nonthermal Electron Energy | |
14 July 2014 by Ryan Milligan | ||
Describing what we know about the dominant energy driving a solar flare. Click the title to read more. | ||
---|---|---|
229 | RHESSI is Annealing Now | |
7 July2014 by Albert Shih and Martin Fivian | ||
A fourth repair job for RHESSI, smoothing out radiation damage. Click the title to read more. | ||
---|---|---|
228 | Mysteries of Flare/CME Initiation | |
8 June 2014 by Shaun Bloomfield and Hugh Hudson | ||
Pairs of flares. Click the title to read more. | ||
---|---|---|
227 | Solar Cosmic Rays, Neutrons, and Fermi Gamma-Rays | |
24 May 2014 by Hugh Hudson and Alec MacKinnon | ||
Exciting new solar high-energy observations. Click the title to read more. | ||
---|---|---|
226 | The 3D standard model for eruptive flares | |
10 May 2014 by Miho Janvier | ||
Torus instability and slipping reconnection. Click the title to read more. | ||
---|---|---|
225 | Microwave Images of a Single-Loop Flare: Observations and Simulations | |
28 April 2014 by Alexey Kuznetsov and Eduard Kontar | ||
A flare analysis making use of the new GX Simulator modeling software. Click the title to read more. | ||
---|---|---|
224 | Abundances in Solar Flares | |
21 April 2014 by Harry Warren | ||
Wrinkles in the FIP effect for flares. Click the title to read more. | ||
---|---|---|
223 | Homing in on Flare Energy | |
14 April 2014 by Hugh Hudson and Ryan Milligan | ||
Representing the spectral energy distribution of a flare. Click the title to read more. | ||
---|---|---|
222 | Empirical Constructs and Cartoons | |
24 March 2014 by Forrest Mozer and Hugh Hudson | ||
How our mental images may relate to what's really going on. Click the title to read more. | ||
---|---|---|
221 | Imaging Quasi-Periodic Oscillations in a Simple Flare | |
17 March 2014 by Zongjun Ning and Hugh Hudson | ||
Time-series imaging spectroscopy in a B8 flare. Click the title to read more. | ||
---|---|---|
220 | A Wonderful Cycle 24 Flare | |
3 March 2014 by Säm Krucker and Hugh Hudson | ||
There have been quite a few Cycle 24 X-class flares, and this was one of the nicest. Click the title to read more. | ||
---|---|---|
218 | Instantaneous Flare Properties | |
10 February 2014 by Hugh Hudson | ||
Let's look at the derivative. Click the title to read more. | ||
---|---|---|
217 | Reflection of Coronal Global Waves | |
13 January 2014 by Ines Kienreich and Hugh Hudson | ||
A homologous series of global coronal waves reflects at a coronal-hole boundary. Click the title to read more. | ||
---|---|---|
216 | Flare Coronal Rain | |
23 December 2013 by Hugh Hudson and Säm Krucker | ||
Thermal collapse in flare loops seen in a wonderful new way. Click the title to read more. | ||
---|---|---|
215 | The HEROES Mission: High Energy Replicated Optics to Explore the Sun | |
16 December 2013 by Steven Christe and Albert Shih | ||
Focusing optics to explore the high-energy Sun. Click the title to read more. | ||
---|---|---|
214 | CMEs on young, solar-type stars | |
9 December 2013 by Alicia Aarnio | ||
Stellar flares and CMEs behave like solar ones. Click the title to read more. | ||
---|---|---|
213 | The 1859 Space Weather Event Revisited | |
25 November 2013 by Ed Cliver | ||
Assessing the greatest space-weather events over the centuries. Click the title to read more. | ||
---|---|---|
212 | Hard X-ray Footpoint Asymmetry | |
7 November 2013 by Ya-Hui YANG | ||
The behavior of conjugacy in flare footpoints. Click the title to read more. | ||
---|---|---|
211 | The Halloween Flares and Large-Scale Correlations | |
28 October 2013 by Richard Schwartz and Hugh Hudson | ||
Flares bunch up strikingly. Click the title to read more. | ||
---|---|---|
210 | Scattering Polarization in Solar Flares | |
21 October 2013 by Jiři Štěpán and Petr Heinzel | ||
Linear polarization produced by anisotropy, rather than particle-beam impact. Click the title to read more. | ||
---|---|---|
209 | The Flare that Time Forgot | |
13 October 2013 by Paulo Simöes and Hugh Hudson | ||
A long-forgotten Masuda flare reappears. Click the title to read more. | ||
---|---|---|
208 | The Post-Burst Increase | |
30 September 2013 by Hugh Hudson | ||
Tutorial on flare thermal sources seen in microwaves. Click the title to read more. | ||
---|---|---|
207 | Peristaltic Shocks: a model | |
16 September 2013 by Dana Longcope and Roger Scott | ||
Reconciling reconnection with high preflare coronal densities. Click the title to read more. | ||
---|---|---|
206 | Negative Microwave Bursts | |
3 September 2013 by Victor Grechnev and Hugh Hudson | ||
Negative microwave bursts happen, in association with flares and "Hyder flares," and modern instrumentation makes them very interesting again. Click the title to read more. | ||
---|---|---|
205 | Acceleration-region Densities | |
6 August 2013 by Säm Krucker and Marina Battaglia | ||
Independent constraints on the densities of ions and non-thermal electrons reveal bulk acceleration. Click the title to read more. | ||
---|---|---|
204 | Implosion and Oscillation | |
29 July 2013 by Paulo Simões and Hugh Hudson | ||
The flare implosion originates in the lower atmosphere and involves GOES soft X-rays. Click the title to read more. | ||
---|---|---|
203 | Minoflares | |
1 July 2013 by Iain Hannah and Hugh Hudson | ||
Earmarks of widespread energetic events in the solar atmosphere. Click the title to read more. | ||
---|---|---|
202 | Mars Odyssey/HEND and RHESSI | |
9 June 2013 by Vadim Vybornov and Michael A. Livshits | ||
An event from far behind the solar limb, observed at Mars. Click the title to read more. | ||
---|---|---|
201 | Hard X-rays in Descent | |
27 May 2013 by Aidan O'Flannagain, John Brown and Peter Gallagher | ||
A novel test of the thick-target model. Click the title to read more. | ||
---|---|---|
200 | Too few? Too many? | |
13 May 2013 by Paulo Simões and Eduard Kontar | ||
Too few electrons in the footpoints; too many electrons in the corona. Click the title to read more. | ||
---|---|---|
199 | A huge gamma-ray burst | |
6 May 2013 by David Smith and André Csillaghy | ||
A wonderfully bright gamma-ray burst at Z = 0.34. Click the title to read more. | ||
---|---|---|
198 | Three-phase life leads to corpulent X-ray loops | |
15 April 2013 by Natasha Jeffrey and Eduard Kontar | ||
RHESSI observations explore structural changes in flaring loops. Click the title to read more. | ||
---|---|---|
197 | Antipodal Flares | |
1 April 2013 by B. Pecos and B. Paul | ||
Flares on a solar diameter suggest a new subatomic particle. Click the title to read more. | ||
---|---|---|
196 | Observational evidence for breakout reconnection | |
18 March 2013 by Henry Aurass and Gordon Holman | ||
Coronal particle acceleration marks the eruption of a SEE. Click the title to read more. | ||
---|---|---|
195 | Burst-on-Tail (BOT) | |
4 March 2013 by Alex Struminsky and Ivan Zimovets | ||
A "Burst-on-Tail" (BOT) phenomenon. Click the title to read more. | ||
---|---|---|
194 | Electron re-acceleration and HXR emission | |
18 February 2013 by Heather Ratcliffe and Marian Karlický | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
The properties of global coronal waves sorted out. Click the title to read more. | ||
---|---|---|
173 | RHESSI and IRIS | |
16 April 2012 by Hugh Hudson | ||
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 | ||
Soon, true microwave imaging spectroscopy. Click the title to read more. | ||
---|---|---|
171 | An Fe Cascade | |
12 March 2012 by Hugh Hudson | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
Solar astrometry in 3D. Click the title to read more. | ||
---|---|---|
159 | Solar Max Arrives | |
28 September 2011 by Hugh Hudson and Richard Schwartz | ||
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 | ||
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 | ||
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 | ||
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 | ||
A hard X-ray spike elicits a sympathetic response. Click the title to read more. | ||
---|---|---|
154 | Suzaku Microflares | |
30 June 2011 by S. Ishikawa | ||
Microflares too have powerful particle acceleration. Click the title to read more. | ||
---|---|---|
153 | Acceleration without Heating | |
13 June 2011 by G. Fleishman & E. Kontar | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
RHESSI and SDO see a remarkable flare. Click the title to read more. | ||
---|---|---|