Impulsive Phase Hard X-Ray Source Motions Observed by RHESSI

Details Impulsive Phase Hard X-Ray Source Motions Observed by RHESSI Impulsive Phase Hard X-Ray Source Motions Observed by RHESSI

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp41c..06l&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SP41C-06

Physics

7507 Chromosphere, 7509 Corona, 7519 Flares, 7546 Transition Region, 7554 X Rays, Gamma Rays, And Neutrinos

Scientific paper

High temporal, spatial, and spectral resolution observations by RHESSI have provided some interesting and surprising results. In this paper we present results of our analyses of the spatial evolution during the impulsive phase, in particular the motions of the looptop (LT) and footpoint (FP) sources of flares with a simple loop structure. For the first time, on November 13, 2003 RHESSI observed HXR emissions from the legs of a flaring loop, in contrast to the commonly observed LT and FP emissions. In the 9-30 keV energy range, emissions from the FPs initially appear to extend toward the legs, then rise up, and eventually merge at the LT. This motion happens first at lower energies and proceeds to higher energies, indicating a gradual density increase in the flaring loop, induced possibly by chromospheric evaporation. Spectral analyses are carried out to determine the nature of these sources. We discuss the implications of these results on the particle acceleration, plasma heating, and chromospheric evaporation processes. The work is supported by NASA grants NAG5-12111, NAG5 11918-1, and NSF grant ATM-0312344 at Stanford University.

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