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Relationship between wave processes in sunspots and quasi-periodic pulsations in active region flares
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Sych, Robert A., Nakariakov, V. M. (Valery M.), Karlicky, M. and Anfinogentov, S. (2009) Relationship between wave processes in sunspots and quasi-periodic pulsations in active region flares. Astronomy & Astrophysics, Vol.505 (No.2). pp. 791-799. doi:10.1051/0004-6361/200912132 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361/200912132
Abstract
A phenomenological relationship between oscillations in a sunspot and quasi-periodic pulsations (QPP) in flaring energy releases at an active region (AR) above the sunspot is established. The analysis of the microwave emission recorded by the Nobeyama Radioheliograph at 17 GHz shows a gradual increase in the power of the 3-min oscillation train in the sunspot associated with AR 10756 before flares in this AR. The flaring light curves are found to be bursty with a period of 3 min. Our analysis of the spatial distribution of the 3-min oscillation power implies that the oscillations follow from sunspots along coronal loops towards the flaring site. It is proposed that QPP in the flaring energy releases can be triggered by 3-min slow magnetoacoustic waves leaking from sunspots.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Sunspots -- Spectra, Magnetohydrodynamics -- Research, Plasma waves -- Research, Solar wind, Solar oscillations -- Research | ||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||
Publisher: | EDP Sciences | ||||
ISSN: | 0004-6361 | ||||
Official Date: | October 2009 | ||||
Dates: |
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Volume: | Vol.505 | ||||
Number: | No.2 | ||||
Page Range: | pp. 791-799 | ||||
DOI: | 10.1051/0004-6361/200912132 | ||||
Status: | Peer Reviewed | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Funder: | Royal Society (Great Britain), British Academy (BA), Royal Society (Great Britain). British-Russian Research Collaboration, Akademie věd České republiky [Academy of Sciences of the Czech Republic], Rossiĭskiĭ fond fundamentalʹnykh issledovaniĭ [Russian Foundation for Basic Research] (RFBR) | ||||
Grant number: | 300030701 (AVCR), 08-02-13633- ofi-c (RFFI), 08-02-91860-KO-a (RFFI), 08-02-92204-GFEN-a (RFFI) |
Data sourced from Thomson Reuters' Web of Knowledge
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