Inglis, Andrew R., Nakariakov, V. M. (Valery M.) and Melnikov, V. F. (Victor Fedorovich). (2008) Multi-wavelength spatially resolved analysis of quasi-periodic pulsations in a solar flare. Astronomy & Astrophysics, Vol.487 (No.3). pp. 1147-1153. ISSN 0004-6361

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Abstract

Aims.We aim to perform a spatially resolved analysis of a quasi- periodic pulsation event from 8th May 1998 using microwave data from the Nobeyama Radioheliograph and Radiopolarimeter, and X- ray data from the Yohkoh satellite. Methods. Time spectra of the signals integrated over the emission source are constructed with the use of the Lomb- Scargle periodogram method, revealing the presence of a pronounced 16 s periodicity. The Pixon image reconstruction algorithm and Hanaoka algorithm are used to reconstruct images from the hard X- ray data from Yohkoh/ HXT and Nobeyama Radioheliograph respectively. The phase relationship of the microwave emission was analysed with the use of cross- correlation techniques. Results. The flaring loop was resolved in the microwave band. The hard X- ray sources are found to be located near the footpoint and at the loop apex determined by the soft X- ray image. The apex source is much fainter than footpoint one. In microwave, all parts of the loop are seen to oscillate with the same period and almost in phase. It was not possible to determine the spatial structure of the oscillation in the hard X- ray band. The period and the coherent spatial structure of the oscillation are indicative of the presence of either an MHD sausage mode or a periodic regime of magnetic reconnection.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Solar flares, Solar oscillations, Sun -- Corona, Magnetohydrodynamics
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	September 2008
Volume:	Vol.487
Number:	No.3
Number of Pages:	7
Page Range:	pp. 1147-1153
Identification Number:	10.1051/0004-6361:20079323
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Royal Society (Great Britain), Rossiĭskiĭ fond fundamentalʼnykh issledovaniĭ [Russian Foundation for Basic Research] (RFBR), Science and Technology Facilities Council (Great Britain) (STFC)
Grant number:	06-02-39029 (RFBR), 06-02-16295 (RFBR), 07-02-01066 (RFBR)
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URI:	http://wrap.warwick.ac.uk/id/eprint/29557

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