RHESSI Science Nuggets

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|second_author =  
|second_author =  
|publish_date = 29 September 2009
|publish_date = 29 September 2009
-
|description = ''With an extremely deep integration, RHESSI may have detected X-rays from the base of a post-CME current sheet.''
+
|description = With an extremely deep integration, RHESSI may have detected X-rays from the base of a post-CME current sheet.
|image = icon111.jpg}}
|image = icon111.jpg}}
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|second_author = and Hugh Hudson
|second_author = and Hugh Hudson
|publish_date = 14 September 2009
|publish_date = 14 September 2009
-
|description = ''RHESSI has successfully imaged one of the first flares of Cycle 24 in hard X-rays''
+
|description = RHESSI has successfully imaged one of the first flares of Cycle 24 in hard X-rays
|image = icon110.jpg}}
|image = icon110.jpg}}
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|second_author =  
|second_author =  
|publish_date = 31 August 2009
|publish_date = 31 August 2009
-
|description = ''Eruptions tend not to happen for events that occur deep within an active region''
+
|description = Eruptions tend not to happen for events that occur deep within an active region
|image = icon109.jpg}}
|image = icon109.jpg}}
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|second_author = & Ludwig Klein
|second_author = & Ludwig Klein
|publish_date = 24 August 2009
|publish_date = 24 August 2009
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|description = ''The relativistic solar protons of this event are related to an extended impulsive phase in the low corona''
+
|description = The relativistic solar protons of this event are related to an extended impulsive phase in the low corona
|image = icon108.jpg}}
|image = icon108.jpg}}
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|second_author = & Säm Krucker
|second_author = & Säm Krucker
|publish_date = 12 August 2009
|publish_date = 12 August 2009
-
|description = ''Major flares without CMEs have distinguishing X-ray properties''
+
|description = Major flares without CMEs have distinguishing X-ray properties
|image = icon107.jpg}}
|image = icon107.jpg}}
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|second_author = & Leif Svalgaard
|second_author = & Leif Svalgaard
|publish_date = 21 July 2009
|publish_date = 21 July 2009
-
|description = ''The rise to maximum of Cycle 24 is much weaker, in terms of flare occurrence, than Cycle 23.''
+
|description = The rise to maximum of Cycle 24 is much weaker, in terms of flare occurrence, than Cycle 23.
|image = icon106.jpg}}
|image = icon106.jpg}}
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|second_author =  
|second_author =  
|publish_date = 6 July 2009
|publish_date = 6 July 2009
-
|description = ''Carol Crannell's favorite gamma-ray line may have been detected at last''
+
|description = Carol Crannell's favorite gamma-ray line may have been detected at last
|image = icon105.jpg
|image = icon105.jpg
}}
}}
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|second_author = Marina Battaglia
|second_author = Marina Battaglia
|publish_date = 22 June 2009
|publish_date = 22 June 2009
-
|description = ''A surprise: radio and hard X-ray positions do not agree''
+
|description = A surprise: radio and hard X-ray positions do not agree
|image = icon104.jpg
|image = icon104.jpg
}}
}}
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|second_author =  
|second_author =  
|publish_date = 8 June 2009
|publish_date = 8 June 2009
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|description = ''Spectacular coronal effects with no chromospheric counterpart''
+
|description = Spectacular coronal effects with no chromospheric counterpart
|image = icon103.jpg
|image = icon103.jpg
}}
}}
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|second_author = Valery Nakariakov
|second_author = Valery Nakariakov
|publish_date = 25 May 2009
|publish_date = 25 May 2009
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|description = ''"Coronal seismology" via hard X-rays and microwaves''
+
|description = "Coronal seismology" via hard X-rays and microwaves
|image = icon102.png
|image = icon102.png
}}
}}
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|second_author =  
|second_author =  
|publish_date = 11 May 2009
|publish_date = 11 May 2009
-
|description = ''Do the standard cartoon models of solar flares describe the microflares as well?''
+
|description = Do the standard cartoon models of solar flares describe the microflares as well?
|image = icon101b.png
|image = icon101b.png
}}
}}
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|second_author = Bob Lin
|second_author = Bob Lin
|publish_date = 29 April 2009
|publish_date = 29 April 2009
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|description = ''A brief history of RHESSI.''
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|description = A brief history of RHESSI.
|image = Icon100.jpg
|image = Icon100.jpg
}}
}}
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|second_author = Hugh Hudson
|second_author = Hugh Hudson
|publish_date = 13 April 2009
|publish_date = 13 April 2009
-
|description = ''Cycle 24 is definitely late in arriving, and it's interesting, but this probably has happened before.''
+
|description = Cycle 24 is definitely late in arriving, and it's interesting, but this probably has happened before.
|image = icon99.jpg
|image = icon99.jpg
}}
}}
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|second_author =  
|second_author =  
|publish_date = 30 March 2009
|publish_date = 30 March 2009
-
|description = ''Exploring Chree analysis as applied to total solar irradiance measurements of flares.''
+
|description = Exploring Chree analysis as applied to total solar irradiance measurements of flares.
|image = icon98.jpg
|image = icon98.jpg
}}
}}
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|second_author =  
|second_author =  
|publish_date = 16 March 2009
|publish_date = 16 March 2009
-
|description = ''RHESSI discovers high temperatures, well above those of the corona, in quiescent active regions.''
+
|description = RHESSI discovers high temperatures, well above those of the corona, in quiescent active regions.
|image = icon97.jpg
|image = icon97.jpg
}}
}}
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|second_author = and Fabio Reale
|second_author = and Fabio Reale
|publish_date = 2 March 2009
|publish_date = 2 March 2009
-
|description = ''A recent re-analysis of the relationship between emission measure and temperature in flares stimulates this new nugget.''
+
|description = A recent re-analysis of the relationship between emission measure and temperature in flares stimulates this new nugget.
|image = icon96.png
|image = icon96.png
}}
}}
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|second_author =  
|second_author =  
|publish_date = 16 February 2009
|publish_date = 16 February 2009
-
|description = ''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.''
+
|description = 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.
|image = icon95.png
|image = icon95.png
}}
}}
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|second_author =  
|second_author =  
|publish_date = 2 February 2009
|publish_date = 2 February 2009
-
|description = ''During the sesquicentennial of the Carrington flare, let us not forget how "Space Weather" got its start''.
+
|description = During the sesquicentennial of the Carrington flare, let us not forget how "Space Weather" got its start.
|image = Icon94.jpg
|image = Icon94.jpg
}}
}}
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|second_author = and Hugh Hudson
|second_author = and Hugh Hudson
|publish_date = 21 January 2009
|publish_date = 21 January 2009
-
|description = ''Large-scale plasma motions, as in magnetic reconnection, can directly accelerate high-energy particles.''
+
|description = Large-scale plasma motions, as in magnetic reconnection, can directly accelerate high-energy particles.
|image = Icon93.jpg
|image = Icon93.jpg
}}
}}
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|second_author = and Jim McTiernan  
|second_author = and Jim McTiernan  
|publish_date = 5 January 2009
|publish_date = 5 January 2009
-
|description ='' Comparing RHESSI images with ones simulated from TRACE "white light" reveals striking similarities but intriguing differences.''
+
|description = Comparing RHESSI images with ones simulated from TRACE "white light" reveals striking similarities but intriguing differences.
|image = Icon92.jpg
|image = Icon92.jpg
}}
}}
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|second_author = and Steven Christe  
|second_author = and Steven Christe  
|publish_date = 22 December 2008
|publish_date = 22 December 2008
-
|description = ''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 [http://sprg.ssl.berkeley.edu/~tohban/wiki/index.php/Solar_Cycle_24 Wikified].''
+
|description = 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 [http://sprg.ssl.berkeley.edu/~tohban/wiki/index.php/Solar_Cycle_24 Wikified].
|image = Icon91.png
|image = Icon91.png
}}
}}
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|second_author = and Procheta Mallik  
|second_author = and Procheta Mallik  
|publish_date = 1 December 2008
|publish_date = 1 December 2008
-
|description = ''Compton scattering makes the Sun visible at high energies, via processes related to the galactic cosmic rays. This is not your ordinary Bremsstrahlung...''
+
|description = Compton scattering makes the Sun visible at high energies, via processes related to the galactic cosmic rays. This is not your ordinary Bremsstrahlung...
|image = Icon90.jpg
|image = Icon90.jpg
}}
}}
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|second_author = and Eduard Kontar  
|second_author = and Eduard Kontar  
|publish_date = 17 November 2008
|publish_date = 17 November 2008
-
|description = ''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?''
+
|description = 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?
|image = Icon89.png
|image = Icon89.png
}}
}}
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|second_author = and Allan Tylka
|second_author = and Allan Tylka
|publish_date = 3 November 2008
|publish_date = 3 November 2008
-
|description = ''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.''
+
|description = 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.
|image = Yohkoh countrate 06051998.jpg
|image = Yohkoh countrate 06051998.jpg
}}
}}
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|second_author = and Arnold Benz
|second_author = and Arnold Benz
|publish_date = 13 October 2008  
|publish_date = 13 October 2008  
-
|description = ''Solar decimetric radio bursts - but only the good guys - correlate well with RHESSI hard X-rays.''
+
|description = Solar decimetric radio bursts - but only the good guys - correlate well with RHESSI hard X-rays.
|image = Icon 86.jpg
|image = Icon 86.jpg
}}
}}
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|second_author = and Hugh Hudson
|second_author = and Hugh Hudson
|publish_date = 2008-09-29
|publish_date = 2008-09-29
-
|description = ''RHESSI makes optical images as well as X-ray and gamma-ray ones. This Nugget explains how.''
+
|description = RHESSI makes optical images as well as X-ray and gamma-ray ones. This Nugget explains how.
|image = RHESSI_optical_images_icon.png
|image = RHESSI_optical_images_icon.png
}}
}}
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|second_author = and Richard Starr
|second_author = and Richard Starr
|publish_date =  2008-09-15
|publish_date =  2008-09-15
-
|description = ''MESSENGER is now exploring Mercury. It is also helping RHESSI to understand the solar X-ray spectrum and measure elemental abundances in flares.''
+
|description = MESSENGER is now exploring Mercury. It is also helping RHESSI to understand the solar X-ray spectrum and measure elemental abundances in flares.
|image = Icon 84.jpg
|image = Icon 84.jpg
}}
}}
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|second_author = and Lyndsay Fletcher
|second_author = and Lyndsay Fletcher
|publish_date = 2008-08-27
|publish_date = 2008-08-27
-
|description = ''Observations during the rise phase of a M5.4 flare suggests that hard x-rays may be associated with a jet observed by TRACE.''
+
|description = Observations during the rise phase of a M5.4 flare suggests that hard x-rays may be associated with a jet observed by TRACE.
|image = Icon 83.jpg
|image = Icon 83.jpg
}}
}}
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|second_author = and Beate Stelzer
|second_author = and Beate Stelzer
|publish_date = 2008-08-11
|publish_date = 2008-08-11
-
|description = ''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.''
+
|description = 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.
|image = Icon 82.jpg
|image = Icon 82.jpg
}}
}}
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|second_author = and Hugh Hudson
|second_author = and Hugh Hudson
|publish_date = 2008-07-28
|publish_date = 2008-07-28
-
|description = ''Another look at microflare positions...''
+
|description = Another look at microflare positions...
|image = Icon 81.jpg
|image = Icon 81.jpg
}}
}}
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|second_author = and Brian Welsch
|second_author = and Brian Welsch
|publish_date = 2008-07-14
|publish_date = 2008-07-14
-
|description = ''The sudden energy release of a flare in the solar atmosphere has many consequences. One of them may be the McClymont Jerk''.
+
|description = The sudden energy release of a flare in the solar atmosphere has many consequences. One of them may be the McClymont Jerk.
|image = Icon 80.jpg
|image = Icon 80.jpg
}}
}}
For all previous Nuggets go to the [http://sprg.ssl.berkeley.edu/~tohban/nuggets/ old RHESSI Science Nugget Page.]
For all previous Nuggets go to the [http://sprg.ssl.berkeley.edu/~tohban/nuggets/ old RHESSI Science Nugget Page.]

Revision as of 14:34, 19 October 2009

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
Icon112.jpg
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
Icon111.jpg
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
Icon110.jpg
RHESSI has successfully imaged one of the first flares of Cycle 24 in hard X-rays. Click the title to read more.
109 Confined Flares versus Eruptive Flares
31 August 2009 by Jie Zhang
Icon109.jpg
Eruptions tend not to happen for events that occur deep within an active region. 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
Icon108.jpg
The relativistic solar protons of this event are related to an extended impulsive phase in the low corona. Click the title to read more.
107 CMEless Flares
12 August 2009 by Hugh Hudson & Säm Krucker
Icon107.jpg
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
Icon106.jpg
The rise to maximum of Cycle 24 is much weaker, in terms of flare occurrence, than Cycle 23.. Click the title to read more.
105 The 15.11 MeV Gamma-ray Line Detected?
6 July 2009 by Brian Dennis
Icon105.jpg
Carol Crannell's favorite gamma-ray line may have been detected at last. Click the title to read more.
104 Do solar decimetric spikes originate in coronal X-ray sources?
22 June 2009 by Arnold Benz & Marina Battaglia
Icon104.jpg
A surprise: radio and hard X-ray positions do not agree. Click the title to read more.
103 STEREO observed stealth CME
8 June 2009 by Eva Robbrecht
Icon103.jpg
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
Icon102.png
"Coronal seismology" via hard X-rays and microwaves. Click the title to read more.
101 RHESSI microflares - Flare Cartoons and Reality
11 May 2009 by Sigrid Berkebile-Stoiser
Icon101b.png
Do the standard cartoon models of solar flares describe the microflares as well?. Click the title to read more.
100 RHESSI - Concept to Fruition
29 April 2009 by Brian Dennis & Bob Lin
Icon100.jpg
A brief history of RHESSI.. Click the title to read more.
99 Cycle 24 - don't panic yet!
13 April 2009 by Leif Svalgaard and Hugh Hudson
Icon99.jpg
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
Icon98.jpg
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
Icon97.jpg
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
Icon96.png
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
Icon95.png
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
link=Other Discoveries from Carrington%27s Flare
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
Icon93.jpg
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
Icon92.jpg
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
Icon91.png
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
Icon90.jpg
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
Icon89.png
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
Yohkoh countrate 06051998.jpg
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
CORONAS signing.jpg
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
Icon 86.jpg
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 optical images icon.png
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
Icon 84.jpg
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
link=Hard X-rays from a Jet?
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
link=Are Stellar Flares like Solar Flares?
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.
81 [[The Microflare Height Distribution]]
2008-07-28 by Steven Christe and Hugh Hudson
link=The Microflare Height Distribution
Another look at microflare positions.... Click the title to read more.
80 [[The McClymont Jerk]]
2008-07-14 by Hugh Hudson and Brian Welsch
link=The McClymont Jerk
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.

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