RHESSI hard x-ray imaging spectroscopy of the large gamma-ray flare of 2002 July 23

Emslie, A.G., Kontar, E.P., Krucker, S. and Lin, R.P. (2003) RHESSI hard x-ray imaging spectroscopy of the large gamma-ray flare of 2002 July 23. Astrophysical Journal Letters, 595(2), L107-L110. (doi: 10.1086/378931)

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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Kontar, Professor Eduard
• Authors: Emslie, A.G., Kontar, E.P., Krucker, S., and Lin, R.P.
• Subjects: Q Science > QB Astronomy
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Astrophysical Journal Letters
• ISSN: 2041-8205
• ISSN (Online): 2041-8213