Hard X-Ray Structure of Loop Footpoints in a Solar Limb Flare

Details Hard X-Ray Structure of Loop Footpoints in a Solar Limb Flare Hard X-Ray Structure of Loop Footpoints in a Solar Limb Flare

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640430k&link_type=abstract

American Astronomical Society, AAS Meeting #216, #404.30; Bulletin of the American Astronomical Society, Vol. 41, p.904

Astronomy and Astrophysics

Astronomy

Scientific paper

We apply newly-developed X-ray visibility forward fitting technique to RHESSI data of a well-observed limb flare to investigate the energy and height dependence on sizes, shapes, and position of hard X-ray footpoint sources. The positions, the vertical extents and the widths of hard X-ray sources are measured as a function of energy. Our observations suggest that the vertical and horizontal sizes of footpoints are decreasing with energy while higher energy emission originates progressively deeper in the chromosphere. The characteristic widths of the hard X-ray footpoint source along the limb decrease with height and are consistent with a converging magnetic field in the footpoint. The vertical sizes of X-ray sources are larger than predicted by collisional thick-target transport in a single density scale height chromosphere but can be explained using a multi-threaded density structure of the loop.

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