期刊
ASTRONOMY & ASTROPHYSICS
卷 497, 期 3, 页码 L13-L16出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/200911898
关键词
Sun: flares; Sun: X-rays; gamma rays; methods: data analysis
资金
- [205/06/P135, 205/09/1705]
- [IAA300030701]
- [AV0Z10030501]
Aims. 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. Methods. Using Ramaty High Energy Solar Spectroscopic imager (RHESSI) flare data we fit spatially- and feature-integrated spectra, assuming a kappa distribution for the mean electron flux spectrum. Results. 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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