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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, 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. 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
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of 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
Date:	October 2009
Volume:	Vol.505
Number:	No.2
Page Range:	pp. 791-799
Identification Number:	10.1051/0004-6361/200912132
Status:	Peer Reviewed
Access rights to Published version:	Open Access
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 fundamentalŉykh issledovaniĭ [Russian Foundation for Basic Research] (RFFI)
Grant number:	300030701 (AVCR), 08-02-13633- ofi-c (RFFI), 08-02-91860-KO-a (RFFI), 08-02-92204-GFEN-a (RFFI)
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URI:	http://wrap.warwick.ac.uk/id/eprint/2525