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Kappa distribution and hard X-ray emission of solar flares

SYSNO ASEP	0334859
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Kappa distribution and hard X-ray emission of solar flares
Title	Kappa distribuce a tvrdá rentgenová emise slunečních erupcí
Author(s)	Kašparová, Jana (ASU-R)_{RID, ORCID} Karlický, Marian (ASU-R)_{RID, ORCID}
Source Title	Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361 Roč. 497, č. 3 (2009), L13-L16
Number of pages	4 s.
Language	eng - English
Country	FR - France
Keywords	solar flares ; X-rays ; gamma rays
Subject RIV	BN - Astronomy, Celestial Mechanics, Astrophysics
R&D Projects	GP205/06/P135 GA ČR - Czech Science Foundation (CSF)
	GA205/09/1705 GA ČR - Czech Science Foundation (CSF)
	IAA300030701 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
CEZ	AV0Z10030501 - ASU-R (2005-2011)
UT WOS	000265280500001
DOI	10.1051/0004-6361/200911898
Annotation	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 a 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. Klíčová slova: solar flares, solar X-rays, data analysis.
Workplace	Astronomical Institute
Contact	Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326
Year of Publishing	2010

Number of the records: 1