an overall framework for solar flares? h. s. hudson space sciences laboratory university of...
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An Overall Frameworkfor Solar Flares?
H. S. HudsonSpace Sciences Laboratory
University of California, Berkeley
CS-16 29/08/10
CS-16 29/08/10
Dimming, implosion, oscillations
A broad framework
• How does the flare instability work?• Formation of signatures• Plasma physics• Consequences
- Coronal structure
- Astrobiology?
CS-16 29/08/10
What is the basic physics of a flare/CME, and how do we relate observations of many diverse types to understanding it?
One natural approach is to make a cartoon, understood to be a kind of giant interpolation formula
CS-16 29/08/10
Contributions welcome!
Contributions welcome!
CS-16 29/08/10
Google “Flare Cartoons”
Cartoons
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Tan & Huang 2006
Anzer & Pneuman 1982
Fletcher & Hudson 2008
http://solarmuri.ssl.berkeley.edu/~hhudson/cartoons
Ergun et al. 2002
Formation of signatures:spectroscopy
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• Problem of solar UV spectroscopy (lack of!)• The impulsive phase: transition between thermal and
nonthermal plasma states• Particle acceleration
Plasma physics I: particle acceleration
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• The impulsive phase: electrons at 104 kT dominate
• The coronal phase: LCR ~ 0.1 Lbol
Mewaldt et al. 2007
Plasma physics II
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• How does the flare instability proceed?
• How do we understand the coupling of scales?
• Physics of waves• Ion-neutral physics in the
chromosphere
Consequences
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• The nanoflare hypothesis• Luminosity: Is the diverted energy important?• Hard radiation and astrobiology?
A broad framework
• How does the flare instability work?• Formation of signatures• Plasma physics• Consequences
- Coronal structure
- Astrobiology?
CS-16 29/08/10
What is the basic physics of a flare/CME, and how do we relate observations of many diverse types to understanding it?
One natural approach is to make a cartoon, understood to be a kind of giant interpolation formula
Conclusions
• Solar flares, for all their complexity, have simple organizing principles
• The basic question – “How does the impulsive phase work?” – remains unanswered
CS-16 29/08/10
See also Hudson & Micela, CS-14
Thanks
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CS-16 29/08/10
Magnetic changes during flares
“Confusogram” legend: 10x10 2.5” pixels 240 minutes time base 500 G magnetic range
(Sudol & Harvey 2005)
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Flare energy
Woods et al 2004
Hudson et al 2006
In time In space