Kappa distribution and hard X-ray emission of solar flares

Details Kappa distribution and hard X-ray emission of solar flares Kappa distribution and hard X-ray emission of solar flares

2009-02-20

arxiv.org/abs/0902.3574v2

Astron.Astrophys. 497 (2009) L13-L16

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

4 pages, 4 figures, changed content, accepted to A&A

Scientific paper

10.1051/0004-6361/200911898

We investigate whether the so-called kappa distribution, often used to fit electron distributions detected in-situ in the solar wind, can describe electrons producing the hard X-ray emission in solar flares. Using Ramaty High Energy Solar Spectroscopic imager (RHESSI) flare data we fit spatially- and feature-integrated spectra, assuming kappa distribution for the mean electron flux spectrum. We show that a single kappa distribution generally cannot describe spatially integrated X-ray emission composed of both footpoint and coronal sources. In contrast, the kappa distribution is consistent with mean electron spectra producing hard X-ray emission in some coronal sources.

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