A model for hard X-ray emission from the top of flaring loops

Fletcher, L. and Martens, P. C.H. (1998) A model for hard X-ray emission from the top of flaring loops. Astrophysical Journal, 505(1), pp. 418-431. (doi:10.1086/306137)

[img]
Preview
Text
91464.pdf - Published Version

1MB

Abstract

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.

Item Type:Articles
Keywords:SUN: CORONA, SUN: FLARES, SUN: X-RAYS, GAMMA RAYS
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Fletcher, Professor Lyndsay
Authors: Fletcher, L., and Martens, P. C.H.
Subjects:Q Science > QB Astronomy
Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Group:Astronomy and Astrophysics
Journal Name:Astrophysical Journal
Publisher:American Astronomical Society
ISSN:0004-637X
ISSN (Online):1538-4357
Copyright Holders:Copyright © 1998 The American Astronomical Society
First Published:First published in The Astrophysical Journal 505(1):418-431
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

University Staff: Request a correction | Enlighten Editors: Update this record