The Astrophysical Journal Letters

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The Astrophysical Journal Letters Volume 672 Number 1 Create an alert RSS this journal

Chang Liu et al 2008 ApJ 672 L69 doi:10.1086/525849

The Spatial Distribution of the Hard X-Ray Spectral Index and the Local Magnetic Reconnection Rate

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Chang Liu1, Jeongwoo Lee2, Ju Jing2, Dale E. Gary2 and Haimin Wang1,2

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Abstract References Cited By
The rare phenomenon of ribbon-like hard X-ray (HXR) sources up to 100 keV found in the 2005 May 13 M8.0 flare observed with the Reuven Ramaty High Energy Solar Spectroscopic Imager provides detailed information on the spatial distribution of flare HXR emission. In this Letter, we further investigate the characteristics of HXR emission in this event using imaging spectroscopy, from which we obtain spatially resolved HXR spectral maps during the flare impulsive phase. As a result we found, along a flare ribbon, an anticorrelation relationship between the local HXR flux and the local HXR spectral index. We suggest that this can be regarded as a spatial analog of the well-known temporal soft-hard-soft spectral evolution pattern of the integrated HXR flux. We also found an anticorrelation between the HXR spectral index and the local electric field along the ribbon, which suggests electron acceleration by the electric field during flares.

Subject headings

Sun: flares; Sun: X-rays, gamma rays


Dates

Issue 1 (2008 January 1)

Received 2007 October 5, accepted for publication 2007 November 8

Published 2007 November 30



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