From RHESSI Wiki
Welcome to the RHESSI Science Nuggets: science notes from RHESSI. The following is a time-ordered list of the latest Nuggets added to the wiki. An alphabetical list of wiki Nuggets is also available. If you are looking for older Nuggets than please visit the old RHESSI Science Nuggets and use the search facilities there; for Nuggets in the Wiki format, use your browser's search facility for title words or authors.
We welcome volunteer authors - please see our page of help for authors.
Please note that each Nugget page has a Discussion page, which sometimes has really interesting information.
| 112
| A Bad Time for Flares but a Good Time for Debris
|
| 12 October 2009 by W. Dean Pesnell
|
| Orbital debris - dangerous to satellites in low Earth orbit - has been increasing recently. There are solar and non-solar reasons for this.. Click the title to read more.
|
|
|
| 111
| RHESSI Deep Integrations
|
| 29 September 2009 by Pascal Saint-Hilaire
|
| With an extremely deep integration, RHESSI may have detected X-rays from the base of a post-CME current sheet.. Click the title to read more.
|
|
|
| 110
| RHESSI in Cycle 24
|
| 14 September 2009 by Säm Krucker and Hugh Hudson
|
| RHESSI has successfully imaged one of the first flares of Cycle 24 in hard X-rays. Click the title to read more.
|
|
|
| 108
| Solar Cosmic Rays of the GLE on 20 January 2005
|
| 24 August 2009 by Sophie Masson & Ludwig Klein
|
| The relativistic solar protons of this event are related to an extended impulsive phase in the low corona. Click the title to read more.
|
|
|
Confined Flares versus Eruptive Flares
| 107
| CMEless Flares
|
| 12 August 2009 by Hugh Hudson & Säm Krucker
|
| Major flares without CMEs have distinguishing X-ray properties. Click the title to read more.
|
|
|
| 106
| Where are the flares
|
| 21 July 2009 by Hugh Hudson & Leif Svalgaard
|
| The rise to maximum of Cycle 24 is much weaker, in terms of flare occurrence, than Cycle 23.. Click the title to read more.
|
|
|
| 103
| STEREO observed stealth CME
|
| 8 June 2009 by Eva Robbrecht
|
| Spectacular coronal effects with no chromospheric counterpart. Click the title to read more.
|
|
|
| 102
| Hard X-ray Pulsations in Flares
|
| 25 May 2009 by Andrew Inglis & Valery Nakariakov
|
| "Coronal seismology" via hard X-rays and microwaves. Click the title to read more.
|
|
|
| 99
| Cycle 24 - don't panic yet!
|
| 13 April 2009 by Leif Svalgaard and Hugh Hudson
|
| Cycle 24 is definitely late in arriving, and it's interesting, but this probably has happened before.. Click the title to read more.
|
|
|
| 98
| Chree Analysis for Flares
|
| 30 March 2009 by Hugh Hudson
|
| Exploring Chree analysis as applied to total solar irradiance measurements of flares.. Click the title to read more.
|
|
|
| 97
| High Temperatures in Active Regions
|
| 16 March 2009 by Jim McTiernan
|
| RHESSI discovers high temperatures, well above those of the corona, in quiescent active regions.. Click the title to read more.
|
|
|
| 96
| The Jakimiec Track
|
| 2 March 2009 by Hugh Hudson and Fabio Reale
|
| A recent re-analysis of the relationship between emission measure and temperature in flares stimulates this new nugget.. Click the title to read more.
|
|
|
| 95
| Coronal implosion
|
| 16 February 2009 by Rui Liu
|
| Though we expect flare implosions, we frequently observe explosions (i.e. eruptions). In this nugget, an observation of a contracting flare is described and analyzed.. Click the title to read more.
|
|
|
| 94
| Other Discoveries from Carrington's Flare
|
| 2 February 2009 by Hugh Hudson
|
| During the sesquicentennial of the Carrington flare, let us not forget how "Space Weather" got its start.. Click the title to read more.
|
|
|
| 93
| Collapsing Traps
|
| 21 January 2009 by Boris Somov and Hugh Hudson
|
| Large-scale plasma motions, as in magnetic reconnection, can directly accelerate high-energy particles.. Click the title to read more.
|
|
|
| 92
| RHESSI Simulations of Complicated Flares
|
| 5 January 2009 by Lyndsay Fletcher and Jim McTiernan
|
| Comparing RHESSI images with ones simulated from TRACE "white light" reveals striking similarities but intriguing differences.. Click the title to read more.
|
|
|
| 91
| Cycle 24
|
| 22 December 2008 by Hugh Hudson and Steven Christe
|
| Solar cycle 24 seems to be delayed. Where are the spots? This Nugget discusses the problem and reviews the recent Solar24 meeting, the first in our field to be Wikified.. Click the title to read more.
|
|
|
| 90
| Inverse Compton X-rays from relativistic flare leptons
|
| 1 December 2008 by Alec MacKinnon and Procheta Mallik
|
| Compton scattering makes the Sun visible at high energies, via processes related to the galactic cosmic rays. This is not your ordinary Bremsstrahlung.... Click the title to read more.
|
|
|
| 89
| The Rise and Fall of The Low Energy Cut Off
|
| 17 November 2008 by Ewan Dickson and Eduard Kontar
|
| Solar hard X-rays tend to have a power-law distribution in energy, implying infinite photon numbers at low energy (a "soft X-ray catastrophe"). Can we observe what limits this behavior?. Click the title to read more.
|
|
|
| 88
| SEPs Link not Confirmed
|
| 3 November 2008 by Gerry Share and Allan Tylka
|
| The spectral evolution of a solar hard X-ray burst may give a clue to the acceleration of solar energetic particles (SEPs). This RHESSI Science Nugget questions the validity of this predictor.. Click the title to read more.
|
|
|
| 87
| The SphinX Instrument on CORONAS-PHOTON
|
| 22 October 2008 by Janusz Sylwester and Ken Phillips
|
| An exciting new instrument will begin observations at an exciting time.. Click the title to read more.
|
|
|
| 86
| The Good Guys and the Rascals
|
| 13 October 2008 by B. Dabrowski and Arnold Benz
|
| Solar decimetric radio bursts - but only the good guys - correlate well with RHESSI hard X-rays.. Click the title to read more.
|
|
|
| 85
| RHESSI Optical Images
|
| 2008-09-29 by H. Jabran Zahid and Hugh Hudson
|
| RHESSI makes optical images as well as X-ray and gamma-ray ones. This Nugget explains how.. Click the title to read more.
|
|
|
| 84
| Flare Plasma Abundances - New X-ray Observations
|
| 2008-09-15 by Brian Dennis and Richard Starr
|
| MESSENGER is now exploring Mercury. It is also helping RHESSI to understand the solar X-ray spectrum and measure elemental abundances in flares.. Click the title to read more.
|
|
|
| 83
| [[Hard X-rays from a Jet?]]
|
| 2008-08-27 by Hazel Miller Bain and Lyndsay Fletcher
|
| Observations during the rise phase of a M5.4 flare suggests that hard x-rays may be associated with a jet observed by TRACE.. Click the title to read more.
|
|
|
| 82
| [[Are Stellar Flares like Solar Flares?]]
|
| 2008-08-11 by Hugh Hudson and Beate Stelzer
|
| In this Nugget, we explore an extrasolar flare (aka stellar flare). These stellar and solar flares are similar but it is often in subtle differences that we may learn the most.. Click the title to read more.
|
|
|
| 80
| [[The McClymont Jerk]]
|
| 2008-07-14 by Hugh Hudson and Brian Welsch
|
| The sudden energy release of a flare in the solar atmosphere has many consequences. One of them may be the McClymont Jerk.. Click the title to read more.
|
|
|
For all previous Nuggets go to the old RHESSI Science Nugget Page.
