RHESSI Hard X-Ray Imaging Spectroscopy of the Large Gamma-Ray Flare of 2002 July 23 (original) (raw)

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Published 2003 September 8 • © 2003. The American Astronomical Society. All rights reserved. Printed in U.S.A.
The Astrophysical Journal,Volume 595,Number 2Citation A. Gordon Emslie et al 2003 ApJ 595 L107DOI 10.1086/378931

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Dates

1. Received 2003 March 14
2. Accepted 2003 August 7
3. Published 2003 September 8

1538-4357/595/2/L107

Abstract

We present Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) hard X-ray images in different energy bands for the large X-class flare of 2002 July 23; these images are used to construct spatially resolved hard X-ray spectra for each of four prominent features: a bright, soft source high in the corona, two localized, hard footpoints in opposite polarity magnetic regions that show highly correlated flux and spectral variations in time, and a third footpoint bounded by the other three sources. The power-law spectral indices of the two correlated footpoints differ by ~0.3-0.4, which may be the result of differing column densities from the electron source.

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