RHESSI Science Nuggets

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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 as well as yearly lists. We welcome volunteer authors - please see our page of help for authors

465 When it rippled in one place and exploded in another
25 December 2023 by Ivan ZIMOVETS
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Pulsations precede a flare, but seem unrelated. Click the title to read more.
464 Solar flares: evaporation and simulation‎
18 December 2023 by Malcolm DRUETT
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Fitting beam electrons into multi-dimensional models. Click the title to read more.
463 Pre-impulsive and Impulsive Phases of the March 28, 2022 Sub-Terahertz Flare
11 December 2023 by Galina G. MOTORINA
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A flare with an increasing sub-THz spectrum and sub-THZ precursor information. Click the title to read more.
462 Coronal Bright Points
27 November 2023 by Daniel NÓBREGA-SIVERIO
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Bright EUV rowel-like structures can result from null-point reconnection. Click the title to read more.
461 Aurora-like Radio Emission from a Sunspot
20 November 2023 by Sijie YU
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Maser action above a sunspot. Click the title to read more.
460 Search for a Flare Anticipation Index (FAI)
13 November 2023 by Hugh HUDSON and Jim McTiernan
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Quantifying flare precursors on a few-minute time scale. Click the title to read more.
459 Bouncing motions of fast electrons using Nobeyama Radioheliograph
6 November 2023 by Keitarou MATSUMOTO
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Solar evidence for conservation of second adiabatic invariant in particle motion. Click the title to read more.
458 Impact of nanoflare heating in the lower solar atmosphere
30 October 2023 by Helle BAKKE
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The behavior of nanoflare fast electrons in Bifrost models. Click the title to read more.
457 Precise timing of flare footpoint sources from mid-infrared observations‎
23 October 2023 by Paulo SIMÕES et al.
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Mid-IR observations at high spatial and high temporal resolution: Conjugacy. Click the title to read more.
456 The Greatest GOES Flares‎
25 September 2023 by Hugh HUDSON and Ed CLIVER
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The greatest GOES events, re-analyzed, fall short of expectations. Click the title to read more.
455 Introducing SunSketcher
11 September 2023 by Hugh HUDSON and Gordon EMSLIE
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Galloping towards roundup in the 2024 total solar eclipse. Click the title to read more.
454 TeV Gamma rays from the Quiescent Sun
21 August 2023 by Mehr Un NISA and John BEACOM
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Solar photons at unprecedented high energies. Click the title to read more.
453 Temporal and Spatial Characteristics of Hard X-Ray Sources in Flare Model with Vertical Current Sheet
7 August 2023 by Alexander SHABALIN, Eugenia OVCHINNIKOVA, and Yuri CHARIKOV
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Modeling betatron acceleration in current-sheet development.. Click the title to read more.
452 Spatial Distribution of Magnetic Reconnection Rate in an M6.5 Solar Flare
12 June 2023 by Ju JING
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Linking hard X-rays to high-resolution images that show reconnection rates.. Click the title to read more.
451 Statistical study of Type III bursts and associated HXR emissions
29 May 2023 by Nicole VILMER and Tomin JAMES
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Linking electron populations escaping from the Sun with those that RHESSI detects.. Click the title to read more.
450 Solar flare hard X-rays from the anchor points of an eruptive filament
15 May 2023 by Muriel STIEFEL
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A rare "four-ribbon" flare has been detected in hard X-rays.. Click the title to read more.
449 Did a Solar Flare Accelerate all the Ambient Electrons in the Coronal Acceleration Region?...
1 May 2023 by Gordon EMSLIE, Eduard KONTAR, Galina MOTORINA, and Brian DENNIS
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Considering SOL2017-09-10, probably not.. Click the title to read more.
448 Diagnostics of Spatially-Extended Turbulent Acceleration and Transport
24 April 2023 by Morgan STORES
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Drilling down into the detailed structure of solar-flare energy release by including turbulence with particle acceleration.. Click the title to read more.
447 RHESSI's Re-entry
17 April 2023 by Pascal SAINT-HILAIRE and Hugh HUDSON
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The final demise of RHESSI is this week. Click the title to read more.
446 A Glasgow geomagnetic observation of a solar flare
13 March 2023 by Hugh HUDSON, John MALONE-LEIGH, Graham WOAN, and Chris OSBORNE
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Irish and Scottish geomagnetic observatories see a crochet much like that of the Carrington event. Click the title to read more.

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445 Particle Acceleration in Two Coronal Jets
27 February 2023 by Yixian ZHANG
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Coronal jets with hard X-ray sources at disjoint locations. Click the title to read more.
444 The Curious First Sunquake of Solar Cycle 25‎
13 February 2023 by Alexander KOSOVICHEV
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A double whammy: two distinct sunquakes from SOL2022-05-10.. Click the title to read more.
443 Hard X-ray Pulsations via Gaussian Decomposition
30 January 2023 by Hannah COLLIER and Laura HAYES
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Flare hard X-ray time variations decomposed objectively. Click the title to read more.
442 A possible coronal magnetic flare precursor
16 January 2023 by Enrico LANDI
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Novel measurements of the coronal magnetic field may help with flare prediction. Click the title to read more.
441 A slow HOPE with microwave context
12 December 2022 by Hugh HUDSON
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A new microwave facility at Chashan Observatory, and a prototypical HOPE. Click the title to read more.
440 Rapid variations of Si IV spectra in a flare observed by IRIS at a sub-second cadence
14 November 2022 by Juraj LÖRINČÍK
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Transition-region lines in a flare have a Doppler component revealing quasi-periodic pulsations. Click the title to read more.
439 A Significant Sudden Ionospheric Disturbance Associated with a Massive Gamma-ray Burst
31 October 2022 by Laura HAYES and Peter GALLAGHER
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A first SID observed in broad daylight, from a source far far away. Click the title to read more.
438 Effects of Coronal Structures on the Dynamics of the Global Coronal Wave of SOL2017-09-10‎
17 October 2022 by Huidong HU, Ying D. LIU, and Bei ZHU
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The amazing global coronal wave of SOL2017-09-10 wrapped around the whole Sun, and displayed transmission and reflection at both polar coronal holes. Click the title to read more.
437 KW-Sun: The Konus-Wind Solar Flare Database in Hard X-Ray and Soft Gamma-Ray Ranges
26 September 2022 by Alexandra LYSENKO
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An unrivaled hard X-ray and gamma-ray database is entering its third activity maximum. Click the title to read more.
436 First Detection of Kink Oscillations with Solar Orbiter
19 September 2022 by Sihui ZHONG et al.
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SolO sees coronal oscillations as well as AIA can, and even better. Click the title to read more.
435 Energetic Neutral Hydrogen from Large Solar Flares
6 September 2022 by Glenn MASON
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A rediscovered data treasury reveals the occurrence of many flare/CME events producing solar high-energy neutral atoms. Click the title to read more.
434 Fifty-year Anniversary of the First Detection of Gamma rays from a Solar Flare
8 August 2022 by Jim Ryan, Brian Dennis, and Phil Dunphy
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The rich astrophysics of gamma-ray astronomy began with solar observations fifty years ago. Click the title to read more.
433 Fast Prograde Flows in Solar Active Regions
25 July 2022 by Hugh HUDSON
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Unexpected, unpredicted, and not modeled yet - weird flows in hot active-region loops. Click the title to read more.
432 Undetected Minority-polarity Flux, Moss, and Coronal Heating
11 July 2022 by Yi-Ming WANG
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There's plenty of room in "unipolar" active regions for both polarities, and there is good evidence for them. Click the title to read more.
431 Thermal/Nonthermal with MinXSS and RHESSI
13 June 2022 by Shunsaku NAGASAWA
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Time-domain studies of improved X-ray spectra reveal a "super-hot' component. Click the title to read more.
430 Sun-as-a-star spectroscopic observations of the line-of-sight velocity of a solar eruption on October 28, 2021
30 May 2022 by Yu XU and Hui TIAN
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The observation of the full 3d velocity of a CME, for an anniversary event. Click the title to read more.
429 Carl Størmer
15 April 2022 by Hugh HUDSON and Lyndsay FLETCHER
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Størmer and the theory of trapping in loops. Click the title to read more.
428 Solar Hard X-rays with Insight
21 March 2022 by Wei WANG and Ping ZHANG
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A spectacular limb flare introduces Insight/HXMT, a new observational resource. Click the title to read more.
427 Probing chromospheric current sheets using SST and ALMA co-observations
21 February 2022 by João da SILVA SANTOS
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Emerging magnetic flux appears in ALMA images reflecting coronal current sheets. Click the title to read more.
426 A demonstration of STIX hard X-ray imaging spectroscopy capabilities for an X-class flare (SOL2021-10-28)
7 February 2022 by Andrea BATTAGLIA, Hannah COLLIER, and Säm KRUCKER
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STIX imaging of an X-class flare marks its success. Click the title to read more.
425 A solar flare driven by thermal conduction observed in mid-infrared
24 January 2022 by Guillermo GIMÉNEZ de CASTRO
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Strong 10-micron emission from a GOES C2 flare suggests conductive heating. Click the title to read more.
424 Disk Occultation of a Lopsided Sun‎
10 January 2022 by Hugh HUDSON, Stephen WHITE and Säm KRUCKER
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Observing a spotless Sun can enable observations of the faint corona.. Click the title to read more.
423 Resolving two distinct thermal X-ray components in a compound solar flare
28 December 2021 by Zhenjun ZHOU and Rui LIU
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Superhot coronal sources may be independent loop systems. Click the title to read more.
422 Bridging solar flares to coronal mass ejections
14 December 2021 by Markus ASCHWANDEN
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The Neupert effect allows us to trace coronal mass ejections seamlessly. Click the title to read more.
421 The Jakimiec Diagnostic Diagram
29 November 2021 by Hugh HUDSON
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The joint variation of GOES temperature and emission measure discloses new features via an old tool. Click the title to read more.
420 First look at ALMA/HInode/IRIS microflares
8 November 2021 by Toshifumi SHIMIZU et al.
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High-resolution ALMA and multiwavelength observations of microflaring. Click the title to read more.
419 Thomson scattering near sunspots
25 October 2021 by Pascal Saint-Hilaire et al.
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Completing the modeling of low-coronal Thomson polarimetry. Click the title to read more.
418 A Non-PFSS Global Coronal Model
11 October 2021 by Oliver RICE and Anthony YEATES
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Modeling as convenient as PFSS but much more realistic. Click the title to read more.
417 Manifold Nonthermality
27 September 2021 by Marina BATTAGLIA et al.
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Even weak flares involve multiple sites of non thermal activity. Click the title to read more.
416 X-Rays from a Type I Radio Burst
20 September 2021 by R. RAMESH
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A first identification of type I radio emission with hot plasma. Click the title to read more.
415 Do Hot Onsets Predict Flare Magnitudes?
30 August 2021 by Hugh HUDSON
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Maybe we can tell how big a flare is going to be from its initial development.... Click the title to read more.
414 Confined or Eruptive?
16 August 2021 by Ting LI et al.
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Increased magnetic flux reduces CME eruptivity. Click the title to read more.
413 Impulsive and Gradual Eruptive Gamma Flares and Associated CMEs
19 July 2021 by Alexey STRUMINSKY, Irina GRIGORIEVA and Andrei SADOVSKI
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Extreme behavior of flare/CME events explained by environment. Click the title to read more.
412 The Morphology of Flare Time Profiles
12 July 2021 by Larisa KASHAPOVA et al.
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Systematic comparison of solar and stellar flaring time profiles. Click the title to read more.
411 Flare Pulsation and the Heliosphere
5 July 2021 by Brendan CLARKE et al.
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Flare pulsations link closely to the distant heliosphere. Click the title to read more.
410 STIX, the Hard X-Ray Telescope on board Solar Orbiter
28 June 2021 by Andrea Francesco BATTAGLIA and Säm KRUCKER
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STIX is operational and producing great data. Click the title to read more.
409 Nonequilibrium Ionization of Flare Plasma Observed by Hinode/EIS
14 June 2021 by Shinsuke IMADA
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Evidence for non-equilibrium ionization in the current sheet of SOL2017-09-10. Click the title to read more.
408 Effects of Flares on Solar p-modes
26 April 2021 by Maria-Cristina RABELLO SOARES and Frederic BAUDIN
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No detectable p-mode amplitude changes due to solar flares. Click the title to read more.
407 Subsecond Spikes in Solar Flare X-ray Flux as Seen by Fermi GBM
19 April 2021 by Trevor KNUTH and Lindsay GLESENER
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A new analysis technique pushes hard X-ray time scales to 0.1 sec or faster. Click the title to read more.
406 Negative He 10830 Flare Ribbons and Non-thermal Electrons
12 April 2021 by Graham KERR
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A 1D radiation hydrodynamics model can explain the dark leading edges of He I flare ribbons. Click the title to read more.
405 Tracing the sources of gradual solar energetic particle events
29 March 2021 by David H. BROOKS and Stephanie L. YARDLEY
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Chemical abundances in SEPs suggest an origin in flare-related moss regions. Click the title to read more.
404 The Superflare SOL2017-09-06: from submm to mid-IR
15 March 2021 by Guillermo (Guigue) GIMÉNEZ DE CASTRO
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Glimpsing the "missing decades" of the flare emission spectrum. Click the title to read more.
403 The Neupert Effect Revisited
8 March 2021 by Jiong QIU
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Two time scales for heating individual flare strands. Click the title to read more.
402 FLUKA as a tool for interpreting flare gamma-rays
1 March 2021 by Alec MACKINNON
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The nuclear physics of solar flares captured in a detailed model. Click the title to read more.
401 A Collective Study of 11 NuSTAR Microflares
22 February 2021 by Jessie DUNCAN and Lindsay GLESENER
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Swarms of NuSTAR micro flares. Click the title to read more.

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400 A Solar FRB
15 February 2021 by Dale GARY and Hugh HUDSON
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A new frontier in the solar time domain. Click the title to read more.
399 Richard Schwartz
25 January 2021 by Brian DENNIS and Hugh HUDSON
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Remembering a friend and colleague. Click the title to read more.
398 Observing Solar Flare X-ray Polarization with Prospective CubeSat Missions
4 January 2021 by Natasha JEFFREY
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The polarization of the solar X-ray spectrum generally remains to be observed. Click the title to read more.
397 Solar effects in the local interstellar medium
14 December 2020 by Don GURNETT and Hugh HUDSON
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Relativistic particle events observed _in situ_ in the interstellar medium. Click the title to read more.
396 Investigation of Small-Scale Energy Releases in Hard X-rays with ​FOXSI
7 December 2020 by Subramania ATHIRAY and Juliana VIEVERING
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Hard X-rays and high temperatures from the feeblest microflares. Click the title to read more.
395 What drives impulsive coronal heating?
30 November 2020 by Pradeep CHITTA et al.
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Impulsive footpoint emissions suggest magnetic reconnection in the chromosphere. Click the title to read more.
394 Probing the solar coronal heating function with slow magnetoacoustic waves
16 November 2020 by Dmitrii KOLOTKOV et al.
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Coronal heating models meet damped slow magnetoacoustic waves. Click the title to read more.
393 Self-Consistent Flare Model
2 November 2020 by Wenzhi RUAN and Rony KEPPENS
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Energy transport by fast particles made self-consistent with MHD flare modeling. Click the title to read more.
392 Hot Flare Onsets
26 October 2020 by Hugh HUDSON et al.
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The initial soft X-ray temperatures of solar flares tend to be in the 10-15 MK range. Click the title to read more.
391 Electric Current Neutralization and Eruption
19 October 2020 by Ellis AVALLONE and Xudong SUN
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Coronal currents without neutralizing return currents appear to. Click the title to read more.
390 Prediction of Solar Cycle 25
5 October 2020 by Leif SVALGAARD
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Now we know how big the next solar maximum will be. Click the title to read more.
389 Flare/CME Cartoon Archive
27 September 2020 by Hugh HUDSON
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A new edition of the Flare/CME archive, nearly a half kilotoon now. Click the title to read more.
388 Submerged Flare Acoustic Sources
13 September 2020 by Juan Camilo BUITRAGO CASAS and Angel MARTÍNEZ
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Flare acoustic radiation emanates from a source _inside_ the Sun. Click the title to read more.
387 Circular Ribbon Flare at Microwaves
31 August 2020 by Jeongwoo LEE
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Breakout reconnection reveals itself via microwave polarization measurements.. Click the title to read more.
386 Relation of Non-neutralized electric currents and the activity in active regions
24 August 2020 by P. VEMAREDDY
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Non-neutralized coronal current systems contribute to CME eruptions. Click the title to read more.
385 White-light emission and photospheric magnetic field changes in flares
17 August 2020 by J. Sebastián CASTELLANOS DURÁN and Lucia KLEINT
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There are strong correlations between white-light flare emissions and line-of-sight magnetic field changes. Click the title to read more.
384 Sunspot Differential Rotation in an X-class Flare
10 August 2020 by Richard GRIMES, Balázs PINTÉR and Huw MORGAN
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Observations suggesting how the coronal tail can wag the photospheric dog. Click the title to read more.
383 Energy Partitioning in a Nonthermally Dominated Two-loop Solar Flare
3 August 2020 by Galina MOTORINA et al.
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Modeling the propagation of energy via GX Simulator in an early-impulsive flare. Click the title to read more.
382 SOL2013-11-10 Eruptive Circular-ribbon Flare with Extended Remote Brightenings
31 July 2020 by Chang LIU et al.
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A circular-ribbon event can launch an eruption by breaking through its separatrix dome. Click the title to read more.
381 Extreme-Ultraviolet Late Phase of Solar Flares
22 June 2020 by Rui LIU
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Both arcade and circular-ribbon flares may sometimes spawn EUV late phase emission. Click the title to read more.
380 Energy transport by accelerated particles in the quiet solar atmosphere
15 June 2020 by Lars FROGNER, Boris GUDIKSEN and Helle BAKKE
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A first study of non-thermal particles integrated into an MHD simulation of the solar atmosphere. Click the title to read more.
379 Quasi-periodic pulsations as indicators of oscillatory processes in solar flares
11 May 2020 by Elena KUPRIYANOVA et al.
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Many, many QPPs. Click the title to read more.
378 Rejuvenating Solar Flare Termination Shocks as Particle Accelerators
4 May 2020 by Bin CHEN
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At last, clear evidence for a long-predicted phenomenon. Click the title to read more.
377 Broad symmetrical Doppler-shifted Fe XXI line profiles
20 April 2020 by Vanessa POLITO
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It is difficult to explain "evaporation" line profiles by superposition of unresolved flows. Click the title to read more.
376 Phenomena in the unusually long pre-impulsive phase of SOL2011-06-07
13 April 2020 by Marian KARLICKÝ, Jana KAŠPAROVÁ, and Robert SYCH
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A massive and slowly-rising filament eruption reveals important new signatures of the physics. Click the title to read more.
375 Evidence for a Coronal Shock Wave Origin for Relativistic Protons Producing Solar Gamma-Rays and Observed by Neutron Monitors at Earth‎
6 April 2020 by Athanasios KOULOUMVAKOS and Gerry SHARE
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Successful modeling of prolonged solar gamma-ray emissions and terrestrial ground-level cosmic-ray events. Click the title to read more.
374 Using overlappogram data to find hot flare plasma
23 March 2020 by Louise HARRA
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Imaging Fe XXIV at high resolution with the EIS slot data. Click the title to read more.
373 SOL2017-09-04 (M5.5) 2017 as a Source of Relativistic Electrons and Protons
16 March 2020 by Alexei STRUMINSKII
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Flare-accelerated particles, rather than SEPs, energize sustained gamma-ray emission. Click the title to read more.
372 Heating of the solar photosphere during a white-light flare‎
2 March 2020 by Jan JURČÁK
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The best-ever spectrum of the flare photosphere. Click the title to read more.
371 A Hot Cusp-Shaped Confined Solar Flare
24 February 2020 by Aaron HERNANDEZ-PEREZ
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A flare may have a prominent hot cusp with the help of any eruption. Click the title to read more.
370 The Temporal and Spatial Extension of Gamma-ray Emission from the Sun
17 February 2020 by Nat GOPALSWAMY
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Sustained solar γ-rays and solar cosmic rays. Click the title to read more.
369 A PSP Perihelion
20 January 2020 by Jessie DUNCAN and Hugh Hudson
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The Parker Solar Probe enters its fourth perihelion already. Now. Click the title to read more.
368 Remembering John Brown
13 January 2020 by Alec MacKINNON
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John passed away unexpectedly on 16 November 2019. Click the title to read more.
367 A Global Survey of EUV Coronal Power Spectra
30 December 2019 by Karl Battams
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Time-series parameter maps of imaged power spectra from an AIA pipeline. Click the title to read more.
366 Cosmic Rays over the Rainbow Bridge
16 December 2019 by Hugh Hudson Alec MacKinnon
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Cosmic rays approach the Sun. Click the title to read more.
365 Spectropolarimetric Insight into Plasma-Sheet Dynamics of a Solar Flare
9 December 2019 by Ryan French
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CoMP polarization patterns in SOL2017-09-10 are amazing. Click the title to read more.
364 Lorentz Force Evolution Reveals the Energy Build-up Processes during Recurrent Eruptive Solar Flares‎
18 November 2019 by Ranadeep Sarkar, Nandita Srivastava and Astrid Veronig
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The net Lorentz force clearly exhibits a build-up and release pattern. Click the title to read more.
363 Flare waiting times depend on their magnitudes
11 November 2019 by Hugh Hudson
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Surprising new evidence for the flare build-up and release process. Click the title to read more.
362 Can magnetic reconnection cause solar rainstorms?‎
4 November 2019 by Petra Kohutova
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Impulsive coronal heating resulting from reconnection can trigger coronal rain. Click the title to read more.
361 Non-radial jets on the edges of active regions
14 October 2019 by Peter Wyper
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The very common jet structures we see can naturally combine twist and breakout. Click the title to read more.
360 Searching SOLfully within the Nuggets
7 October 2019 by Hugh Hudson
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The IAU target identifier works well for finding items about a particular event. Click the title to read more.
359 Submillimeter Radiation as the Thermal Component of the Neupert Effect
31 September 2019 by Guillermo Giménez de Castro
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Flare radiation at the highest frequencies can be bremsstrahlung. Click the title to read more.
358 The "Last Best" Flares
24 September 2019 by Hugh Hudson, Ed Cliver, and Brian Dennis
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Major flares tend to happen at the very ends of sunspot cycles. Click the title to read more.
357 Dynamic Processes of the Moreton Wave on 2014 March 29‎
16 September 2019 by Denis Cabezas and the FMT team
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A beautiful Moreton wave excited by the best-observed flare ever. Click the title to read more.
356 EVE-RHESSI DEM Models and the Low-energy Cutoff for Nonthermal Electrons
9 September 2019 by Jim McTiernan
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Characterizing flare temperature distributions helps to define the non-thermal energy release. Click the title to read more.
355 Stealth Coronal Mass Ejections from Active Regions
26 August 2019 by Jennifer O'Kane
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Perhaps just feeble versions of the same magnetic disease.... Click the title to read more.
354 Do Kepler Superflare Stars Really Include Slowly Rotating Sun-like Stars?‎
15 July 2019 by Yuta NOTSU
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Kepler superflares hint at solar superflares. Click the title to read more.
353 Localized Microwave and EUV Bright Structures in an Eruptive Prominence
22 June 2019 by Jing HUANG
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Detailed correlations between EUV and microwaves in prominence fine structures. Click the title to read more.
352 Broken-up hard X-ray spectra found for a loop-top source during a solar limb flare
16 June 2019 by Hao NING, Yao CHEN and Jeongwoo LEE
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SOL2017-09-10 coronal hard X-ray sources. Click the title to read more.
351 The Cosmic-Ray Shadow and Coronal Magnetism
27 May 2019 by Frederik Tenholt
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The coronal magnetic field measured in Antarctica. Click the title to read more.
350 Kristian Birkeland
6 May 2019 by Hugh HUDSON and Lyndsay FLETCHER
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Space weather a century ago: Kristian Birkeland. Click the title to read more.
349 Warm UV loops heated by small-scale cancellation events
22 April 2019 by Seray ŞAHIN and Vasyl YURCHYSHYN
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Precisely locating the footpoints of warm coronal loops helps identify their source(s) of excitation. Click the title to read more.
348 Multiple Regions of Shock-accelerated Particles during a Solar Coronal Mass Ejection
1 April 2019 by Diana MOROSAN
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LOFAR identifies herringbone sources within the flank of the SOL2017-09-10 shock - no joke. Click the title to read more.
347 Persistent Quasi-Periodic Pulsations Detected During the Large X8.2 Solar Flare
25 March 2019 by Laura HAYES and Peter GALLAGHER
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The most beautiful flare has the most beautiful pulsations. Click the title to read more.
346 Is the coronal magnetic field braiding?
11 March 2019 by Markus ASCHWANDEN
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This iconic cartoon does not relate well to the observations. Click the title to read more.
345 An energetic pre-flare: electron distributions in magnetic reconnection outflows
18 February 2019 by Marina BATTAGLIA, Eduard KONTAR and Galina MOTORINA
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Assessing energy partition in a pre-impulsive flare development. Click the title to read more.
344 Linear Polarization in H-alpha Flares
4 February 2019 by Tomoko KAWATE and Yoichiro HANAOKA
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H-alpha polarization is rarely observable but, in once case, very suggestive. Click the title to read more.
343 Short-Period Waves
21 January 2019 by Sijie YU and Bin CHEN
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New decimetric imaging spectroscopy suggests Alfvénic energy transport in flares. Click the title to read more.
342 The Interesting RHESSI/SAS Archive
8 January 2019 by Hugh HUDSON and Martin FIVIAN
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The full mission database shows RHESSI to have been very stable geometrically. Click the title to read more.
341 Homologous White Light Solar Flares‎
31 December 2018 by Paolo ROMANO and Abouazza ELMHAMDI
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Homologous white-light flares, in rapid succession, and coronal null points. Click the title to read more.
340 The flight of FOXSI-3
10 December 2018 by Lindsay GLESENER and Noriyuki NARUKAGE
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Single-photon counting and direct focusing across hard and soft energies. Click the title to read more.
339 Stellar Flares and Starspots
3 December 2018 by Lauren DOYLE
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Stellar flares don't spatially match their starspots. Click the title to read more.
338 Neutron Production in Solar Flares
26 November 2018 by Ron MURPHY and Gerry SHARE
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Neutron astronomy helps us understand solar flares. Click the title to read more.
337 Cycle 25 Strikes Again
20 November 2018 by Kamil BICZ
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A second, larger Cycle 25 sunspot. Click the title to read more.
336 Remembering Marcos Machado via his research
13 November 2018 by Hugh HUDSON
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Recalling a friend and colleague, and admiring his final paper. Click the title to read more.
335 CORONAS/SPIRIT Mg XII and Nanoflares‎
22 October 2018 by Anton REVA
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Monochromatic Mg XII spectroheliography sets severe limits on nanoflare heating models. Click the title to read more.
334 White-light Emission and Non-thermal Electrons‎
8 October 2018 by Kyoung-Sun LEE
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An intimate relationship between accelerated electrons and visible flare continuum. Click the title to read more.
333 Coronal Hard X-ray Sources Revisited
24 September 2018 by Brian DENNIS
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Reporting some over-interpretation of the evidence for "coronal thick targets". Click the title to read more.
332 Photospheric response to a flare
17 September 2018 by Mike WHEATLAND
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Sudden changes in the magnetic field in the low atmosphere associated with particle acceleration. Click the title to read more.
331 New Views of Global Solar Magnetic Field Evolution Over Four Solar Cycles
27 August 2018 by David WEBB
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A digital archive of Pat McIntosh's 44 years of solar synoptic observations. Click the title to read more.
330 Understanding the co-spatial return current in solar flares
6 August 2018 by Meriem ALAOUI and Gordon HOLMAN
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Completing the circuit in a thick-target model. Click the title to read more.
329 3D Magnetic Reconnection at a Coronal Null Point
30 July 2018 by Shane MALONEY, Aidan O'Flannagain and Peter Gallagher
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Large-scale reconnection involved in Type I radio noise storm. Click the title to read more.
328 The true dawn of multimessenger astronomy
23 July 2018 by Hugh Hudson
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Ever since the Carrington flare. Click the title to read more.
327 Microwave Imaging Spectroscopy of Flares is Here‎
16 July 2018 by Dale E. Gary, EOVSA and RHESSI Teams
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Microwave imaging spectroscopy takes a giant leap forward with SOL2017-09-10. Click the title to read more.
326 Coronal nanoflares powered by footpoint reconnection
9 July 2018 by Pradeep Chitta, Hardi Peter, and Sami Solanki
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Coronal nanoflares in active region cores can be powered by the magnetic reconnection in the lower solar atmosphere. Click the title to read more.
325 A remarkable, but confused, coronal hard X-ray source
25 June 2018 by Alexandra Lysenko, Larisa Kashapova and Hugh Hudson
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A remarkable flare in 1999 adds to our short list of extended coronal hard X-ray/microwave sources. Click the title to read more.
324 Understanding HMI pseudocontinuum in white-light flares‎
28 May 2018 by Michal Švanda et al.
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The HMI pseudocontinuum (Ic) is ill-calibrated in regions with strong fields, i.e. for white-light flares. Click the title to read more.
323 To beam or not to beam - that is (still) the question
14 May 2018 by Paulo Simões and Hugh Hudson
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Descriptions of the lower solar atmosphere of flares ca. Cycle 21 sound surprisingly current. Click the title to read more.
322 Observation of Cosmic Ray Spallation Events from SoHO‎
7 May 2018 by Serge Koutchmy and Ehsan Tavabi
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LASCO's images capture high-energy nuclear interactions from cosmic-ray hits. Click the title to read more.
321 A Sunspot from Cycle 25 for sure
10 April 2018 by Tomek Mrozek and Hugh Hudson
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YES! Cycle 25 is here!. Click the title to read more.
320 Blue-wing enhancement of the Mg II h and k lines in a flare
9 April 2018 by Akiko TEI
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Flare loops involve a cool upflow preceding the hot evaporation flow. Click the title to read more.
319 NuSTAR detects X-ray flares in the quiet Sun
26 March 2018 by Matej Kuhar and Säm Krucker
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Quiet-Sun flares may not be powerful, but they look a lot like ordinary flares. Click the title to read more.
318 Homologous CME/flares from AR 12371
19 March 2018 by Panditi Vemareddy and Pascal Demoulín
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An excellent set of homologous flare/CMEs analyzed and explained. Click the title to read more.
317 Non-Maxwellian Diagnostics from SDO/EVE Spectra of an X-class Flare
16 February 2018 by Elena Dzifčáková and Jaroslav Dudík
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Ratios of high-excitation ions can readily detect κ-distributions in flare plasmas. Click the title to read more.
316 Joint MinXSS and RHESSI Flare X-ray Spectra between 1 and 15 keV
5 February 2018 by Chris Moore, Brian Dennis and the MinXSS Science Team
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MinXSS adds systematic views of flare soft X-ray spectra to RHESSI imagery. Click the title to read more.
315 Parameterized Flare Models with Chromospheric Compressions
17 January 2018 by Adam Kowalski & Joel Allred
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A new approach to modeling the lower flare atmosphere. Click the title to read more.
314 A Curious Sunspot Group in 2018
14 January 2018 by Hugh Hudson
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The first new sunspot group of 2018 emerged at the wrong latitude. Click the title to read more.
313 Tecumseh's Eclipse and Astrophysics
25 December 2017 by Hugh Hudson
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The solar corona was first recognized as such, and named, in an eclipse of 1806. Click the title to read more.
312 Hunting for Hidden Tiny Flares
27 November 2017 by Shin-nosuke ISHIKAWA
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FOXSI-2 says that episodic energy releases are still viable as a part of the coronal heating problem.. Click the title to read more.
311 Unusual Type III Burst Dynamics Produced by Diverging Magnetic Fields
20 November 2017 by Patrick McCauley
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Unusual type III bursts follow coronal separatrix structures.. Click the title to read more.
310 Valderrama in the 21st Century
31 October 2017 by Hugh Hudson
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A newly-described white-light flare from the 19th century!... Click the title to read more.
309 Electron Scattering in the Flaring Corona
24 October 2017 by Sophie Musset
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Diffusive transport may contribute to the trapping of electrons in coronal X-ray sources. Click the title to read more.
308 The Power of Turbulence
25 September 2017 by Nic Bian
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Turbulent energy content may underlie flare energy transfer, magnetic reconnection, and particle acceleration. Click the title to read more.
307 The Kelvin Force and Loop-Top Concentration
18 September 2017 by Kiyoto SHIBASAKI
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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
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Right on schedule, Cycle 24 has produced a great flare (with a GLE). Click the title to read more.
305 Electric Current Neutralization and Solar Eruption in Active Regions
28 August 2017 by Yang LIU
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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
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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
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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
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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
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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
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A toy model hoping to explain the SEP/LAT relationship. Click the title to read more.

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