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Quasi-periodic pulsations in the gamma-ray emission of a solar flare

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Nakariakov, Valery M., Foullon, C. (Claire), Myagkova, I. N. and Inglis, Andrew R.. (2010) Quasi-periodic pulsations in the gamma-ray emission of a solar flare. Astrophysical Journal Letters, Vol.708 (No.1). L47-L51. ISSN 2041-8213

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Official URL: http://dx.doi.org/10.1088/2041-8205/708/1/L47

Abstract

Quasi-periodic pulsations (QPPs) of gamma-ray emission with a period of about 40 s are found in a single loop X-class solar flare on 2005 January 1 at photon energies up to 2-6 MeV with the SOlar Neutrons and Gamma-rays (SONG) experiment aboard the CORONAS-F mission. The oscillations are also found to be present in the microwave emission detected with the Nobeyama Radioheliograph, and in the hard X-ray and low energy gamma-ray channels of RHESSI. Periodogram and correlation analysis shows that the 40 s QPPs of microwave, hard X-ray, and gamma-ray emission are almost synchronous in all observation bands. Analysis of the spatial structure of hard X-ray and low energy (80-225 keV) gamma-ray QPP with RHESSI reveals synchronous while asymmetric QPP at both footpoints of the flaring loop. The difference between the averaged hard X-ray fluxes coming from the two footpoint sources is found to oscillate with a period of about 13 s for five cycles in the highest emission stage of the flare. The proposed mechanism generating the 40 s QPP is a triggering of magnetic reconnection by a kink oscillation in a nearby loop. The 13 s periodicity could be produced by the second harmonics of the sausage mode of the flaring loop.

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Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Solar oscillations, Solar flares, X-ray bursts
Journal or Publication Title:	Astrophysical Journal Letters
Publisher:	IOP Publishing Ltd
ISSN:	2041-8213
Date:	1 January 2010
Volume:	Vol.708
Number:	No.1
Number of Pages:	5
Page Range:	L47-L51
Identification Number:	10.1088/2041-8205/708/1/L47
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
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URI:	http://wrap.warwick.ac.uk/id/eprint/16640