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 | ||
The biggest solar telescope finds still smaller scales for white-light flaring - and more. Click the title to read more. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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294 | Edward Chupp | |
6 March 2017 by RHESSI | ||
. Click the title to read more. | ||
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293 | Pierre Kaufmann | |
19 February 2017 by RHESSI | ||
. Click the title to read more. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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228 | Mysteries of Flare/CME Initiation | |
8 June 2014 by Shaun Bloomfield and Hugh Hudson | ||
Pairs of flares. Click the title to read more. | ||
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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. | ||
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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. | ||
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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. | ||
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224 | Abundances in Solar Flares | |
21 April 2014 by Harry Warren | ||
Wrinkles in the FIP effect for flares. Click the title to read more. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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218 | Instantaneous Flare Properties | |
10 February 2014 by Hugh Hudson | ||
Let's look at the derivative. Click the title to read more. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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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. | ||
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