Coronal Hard X-ray Emission in Occulted Flares

Details Coronal Hard X-ray Emission in Occulted Flares Coronal Hard X-ray Emission in Occulted Flares

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh13a1131b&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH13A-1131

Physics

7509 Corona, 7519 Flares, 7554 X Rays, Gamma Rays, And Neutrinos, 7594 Instruments And Techniques

Scientific paper

We use RHESSI to investigate coronal sources in six behind-the-limb flares with occulted or partially occulted footpoints. The major findings are as follows: (1) Coronal hard X-ray (> 20 keV) emission is observed above thermal soft X-ray (< 12 keV) and EUV (195 Å) emission (which confirms Masuda's above-the-loop-top source); (2) Coronal HXR sources show impulsive (on a scale of tens of seconds) variation in their HXR time profiles; (3) The data can be fitted with a power law component with an index of 5 to 7 or with several thermal components with very high temperatures up to 100 MK. Presently, using the derived physical parameters, we test various heating models to determine whether the coronal HXR emission is thermal or non-thermal.

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