Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh13b1540g&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH13B-1540
Physics
7509 Corona, 7519 Flares, 7554 X-Rays, Gamma Rays, And Neutrinos
Scientific paper
The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) is optimized for fine energy and spatial resolution of hard X-ray (HXR) emission from solar flares. Most RHESSI flares exhibit strong HXR emission from bright flare loop footpoints, drowning out faint emission from higher in the corona. Partial occultation of flares by the solar disk obscures these bright footpoints, allowing for detailed observations of faint coronal HXR sources. It is therefore necessary to identify and characterize flares with high occultation heights. Here we present a technique for determining flare occultation heights by extrapolating the paths of active flare regions across the solar disk. A statistical study of 55 flares compares occultation heights to nonthermal X-ray emission. Compared with statistical results of on-disk flares, it is estimated that this coronal emission is at least 20 times fainter than the expected footpoint emission, confirming that partial occultation is crucial for the study of faint coronal sources. HXR images made by RHESSI are also compared with images at longer wavelengths from the TRACE, EIT, and STEREO instruments.
Glesener Lindsay
Krucker Sa"m
Lin Robert P.
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