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Altitude Dependence of Hard X-Ray Spectra in Solar Flares

Published online by Cambridge University Press:  01 November 2006

Q. R. Chen ,
M. D. Ding  and
P. F. Chen
Q. R. Chen
Affiliation:
Department of Astronomy, Nanjing University, Nanjing 210093, China; dmd@nju.edu.cn
M. D. Ding
Affiliation:
Department of Astronomy, Nanjing University, Nanjing 210093, China; dmd@nju.edu.cn
P. F. Chen
Affiliation:
Department of Astronomy, Nanjing University, Nanjing 210093, China; dmd@nju.edu.cn
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Abstract

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We investigate the altitude dependence of hard X-ray (HXR) spectra in solar flares, i.e., whether the HXR spectra are related to the altitudes of reconnection sites. We assume that the reconnection altitude can be scaled by the distance between the two conjugate HXR footpoints in the flare. By searching the RHESSI flare list from 2002 to 2004, we find 42 solar flares below X-class that have enhanced 50–100 keV HXR emission and two well-resolved HXR footpoints at the nonthermal peak time. The preliminary results show that there is a weak correlation ($\sim$ –0.31) between the HXR spectral index and the HXR footpoint distance. We further discuss the possible implications.

Keywords

Sun: flaresSun: X-raysgamma rays
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S233: Solar Activity and its Magnetic Origin , March 2006 , pp. 177 - 178
Copyright
© 2006 International Astronomical Union