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Quasi-periodic oscillations in solar X-ray sources
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SYSNO ASEP 0360451 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Quasi-periodic oscillations in solar X-ray sources Author(s) Mészárosová, Hana (ASU-R) RID, ORCID
Karlický, Marian (ASU-R) RID, ORCID
Fárník, František (ASU-R) RID, ORCIDNumber of authors 3 Source Title Advances in Plasma Astrophysics. - Cambridge : Cambridge University Press, 2011 / Bonanno A. - ISSN 1743-9213 - ISBN 9780521197410 Pages s. 252-254 Number of pages 3 s. Action Symposium of the International Astronomical Union /274./ Event date 06.09.2010-10.09.2010 VEvent location Giardini Naxos Country IT - Italy Event type WRD Language eng - English Country GB - United Kingdom Keywords Sun ; flares ; X-rays Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics R&D Projects IAA300030701 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z10030501 - ASU-R (2005-2011) UT WOS 000305161800059 DOI 10.1017/S1743921311007071 Annotation We have searched for quasi-periodic oscillations in the hard X-ray emission of solar flares. We have selected 14 flare events which were divided into two groups: a) the events with the X-ray sources located at the flare loop footpoints and b) the events with the X-ray source above the solar limb, i.e. with the loop-top X-ray source. We found that while in the case with the footpoints X-ray sources the quasi-periods of the recorded oscillations were in the interval 2–380 s, in the events with loop-top sources only the quasi-periods longer than 50 s were recognized. These results are probably connected with the MHD oscillation modes of the flaring loop. While the long periods, which are dominant in loop-top sources, are produced by acoustic oscillations along the whole long loop, in the layers close to the loop footpoints also the MHD wave modes in shorter structures with shorter periods are generated. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2012
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