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Coronal Hard X-raysCome of Age
H. S. Hudson
SSL, UC Berkeley
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St. Andrews Jan. 20, 2009
What are coronal hard X-rays?
• Direct emission from dynamic structures in the corona, rather than Neupert/SHS/footpoint paradigm
• An alternative source of knowledge (viz. radio) on particle distribution functions
• RHESSI (the 4th HXR imager) has shown that one can routinely see coronal hard X-ray emission
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St. Andrews Jan. 20, 2009
A deceptive view of flare physics?
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St. Andrews Jan. 20, 2009
QuickTime™ and aTIFF (LZW) decompressor
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QuickTime™ and aTIFF (Uncompressed) decompressor
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Old
New
Coronal Hard X-rays: Old & New
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St. Andrews Jan. 20, 2009
Conclusions
• Krucker et al., A&A Review 2008• All major events show high coronal hard X-ray sources• Emission detected even at energies above 100 keV• Focusing optics holds great promise to extend this
diagnostic tool by orders of magnitude in sensitivity
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St. Andrews Jan. 20, 2009
Challenge
• How can we make new progress in high-energy solar physics?
- a RHESSI follow-on
- a Nobeyama follow-on (FASR)