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Multi-Wavelength Analysis of High-Energy Electrons in Solar Flares. A Case Study of the August 20, 2002 Flare
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SYSNO ASEP 0024434 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Multi-Wavelength Analysis of High-Energy Electrons in Solar Flares. A Case Study of the August 20, 2002 Flare Title Spektrální analýza vysokoenergetic kých elektronů ve slunečních erupcích: případová studie erupce z 20. srpna 2002 Author(s) Kašparová, Jana (ASU-R) RID, ORCID
Karlický, Marian (ASU-R) RID, ORCID
Kontar, E. P. (GB)
Schwartz, R. A. (US)
Dennis, B. R. (US)Source Title Solar Physics. - : Springer - ISSN 0038-0938
Roč. 232, 1-2 (2005), s. 63-86Number of pages 24 s. Language eng - English Country NL - Netherlands Keywords solar flares ; RHESSI ; albedo ; Halpha ; radio Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics R&D Projects IAA3003202 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) IAA3003203 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) GA205/04/0358 GA ČR - Czech Science Foundation (CSF) GA205/02/0980 GA ČR - Czech Science Foundation (CSF) KSK2043105 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z10030501 - ASU-R (2005-2011) Annotation A multi-wavelength (RHESSI, Hα, radio, TRACE, MDI) spatial and temporal analysis of solar high-energy electrons is conducted using the August 20, 2002 flare of an unusually flat hard X-ray spectrum. A new method to account for X-ray Compton backscattering in the photosphere (photospheric albedo) has been used to deduce the primary X-ray flare spectra. We show that the contribution of the photospheric albedo to the photon spectrum modifies the calculated mean electron flux distribution. The radio emission and the positions of the Hα and hard X-ray sources with respect to the current-free extrapolation of the photospheric magnetic field provide evidence of the closed geometry of the magnetic field and the flare process in low altitude magnetic loops. The hard X-ray sources are located on the external edges of the Hα emission and show chromospheric plasma heated by the high-energy electrons. The fast changes of Hα emission are found inside the hard X-ray sources as well as away from them. Workplace Astronomical Institute Contact Anežka Melichárková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2006
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