A Model for Hard X-Ray Emission from the Top of Flaring Loops

Details A Model for Hard X-Ray Emission from the Top of Flaring Loops A Model for Hard X-Ray Emission from the Top of Flaring Loops

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...505..418f&link_type=abstract

The Astrophysical Journal, Volume 505, Issue 1, pp. 418-431.

Astronomy and Astrophysics

Astronomy

38

Sun: Corona, Sun: Flares, Sun: X-Rays, Gamma Rays

Scientific paper

The frequent occurrence of hard X-ray emission from the top of flaring loops was one of the discoveries by the Hard X-Ray Telescope on board the Japanese Yohkoh satellite. In this paper we take a flare current-sheet geometry and show how the combined effect of magnetic field convergence and pitch-angle scattering of nonthermal electrons injected at the top of the loop results in the generation of a looptop source with properties akin to those observed by Yohkoh. We demonstrate that a looptop source can be produced in both impulsive and gradual phase loops. We further present a possible mechanism for the generation of high-temperature ``ridges'' in the loop legs.

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