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Sources of Quasi-periodic Pulses in the Flare of 18 August 2012
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SYSNO ASEP 0458324 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Sources of Quasi-periodic Pulses in the Flare of 18 August 2012 Author(s) Altyntsev, A. (RU)
Meshalkina, N. (RU)
Mészárosová, Hana (ASU-R) RID, ORCID
Karlický, Marian (ASU-R) RID, ORCID
Palshin, V. (RU)
Lesovoi, S. (RU)Number of authors 6 Source Title Solar Physics. - : Springer - ISSN 0038-0938
Roč. 291, č. 2 (2016), s. 445-463Number of pages 19 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords radio emission ; active regions ; oscillations Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics R&D Projects GAP209/12/0103 GA ČR - Czech Science Foundation (CSF) Institutional support ASU-R - RVO:67985815 UT WOS 000372878200008 EID SCOPUS 84961217878 DOI 10.1007/s11207-016-0846-9 Annotation We analyzed spatial and spectral characteristics of quasi-periodic pulses for the limb flare on 18 August 2012, using new data from a complex of spectral and imaging instruments developed by the Siberian Solar Radio Telescope team and the Wind/Konus gamma-ray spectrometer. A sequence of broadband pulses with periods of approximately ten seconds were observed in X-rays at energies between 25 keV and 300 keV, and in microwaves at frequencies from a few GHz up to 34 GHz during an interval of one minute. The 17 and 34 GHz microwave sources were at the footpoints of the small loop system, the source emitting in the 4.2 – 7.4 GHz band in the large system. The QPPs were probably generated by modulated acceleration processes in the energy-release site. We determined the plasma parameters in the radio sources by analyzing the spectra. The microwave pulses might be explained by relatively weak variations of the spectral hardness of the emitting electrons. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2017
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