Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp51a09m&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SP51A-09
Physics
7519 Flares, 7554 X Rays, Gamma Rays, And Neutrinos
Scientific paper
One of the most curious discoveries to come from the Yohkoh mission is the observation of hard X-ray emission from the top of some impulsive flare coronal loops. Typically, hard X-ray emission is seen from the loop footpoints, where the ambient density is relatively high; how such emission can emanate from the top of a loop, where the plasma density is low, is a fundamental question in impulsive flare acceleration theory. We will present an improvement of an electron acceleration model that employs transit-time damping of fast mode MHD waves, and which naturally yields enhanced electron acceleration (and thus hard X-ray emission) away from the loop footpoints. Furthermore, this enhancement is exacerbated by partial magnetic mirroring, which would result from any compression of the coronal magnetic field. The time- and spatially-dependent electron distribution is determined by a quasilinear diffusion equation, which we solve using a Monte Carlo simulation and the novel technique of stochastic differential equations. BEM and MEO are supported by an NSF REU Grant ATM 9820339; JAM supported by NASA SEC Solar Physics grant NAG5-9598.
Marsteller Brian E.
Miller Aaron J.
Orr Ewan
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