RHESSI Science Nuggets 200 to 299

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299 High Resolution Temporal and Spatial Structure of a White Light Flare
30 April 2017 by Vasyl Yurchyshyn
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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
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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
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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
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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
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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
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. Click the title to read more.
293 Pierre Kaufmann
19 February 2017 by RHESSI
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. Click the title to read more.
292 RHESSI's 15th Anniversary
13 February 2017 by Brian Dennis, Säm Krucker and Albert Shih
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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A global coronal shock wave without a CME driver. Click the title to read more.
277 Spotlessness returns
27 June 2016 by Hugh Hudson
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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A long-forgotten Masuda flare reappears. Click the title to read more.
208 The Post-Burst Increase
30 September 2013 by Hugh Hudson
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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
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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
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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
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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
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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
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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
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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
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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
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Too few electrons in the footpoints; too many electrons in the corona. Click the title to read more.
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