Nakariakov, Valery M. and Melnikov, V. F. (Victor Fedorovich). (2006) Modulation of gyrosynchrotron emission in solar and stellar flares by slow magnetoacoustic oscillations. Astronomy & Astrophysics, Vol.446 (No.3). pp. 1151-1156. ISSN 0004-6361

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Abstract

Gyrosynchrotron emission generated by non-thermal electrons in solar and stellar coronal flares can be efficiently modulated by slow magnetoacoustic oscillations in the flaring loops. The modulation mechanism is based upon perturbation of the efficiency in the Razin suppression of optically thin gyrosynchrotron emission. Modulation of the emission is in anti-phase with the density perturbation in the slow wave. The observed emission modulation depth can be up to an order of magnitude higher than the slow wave amplitude. This effect is more pronounced at lower frequencies. Observations with spatial resolution, together with analysis of the modulation frequency, are shown to be sufficient for providing the information needed to identify the mode.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Solar flares, Sun -- Corona, Solar oscillations, Stellar oscillations, Stars -- Corona
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	February 2006
Volume:	Vol.446
Number:	No.3
Page Range:	pp. 1151-1156
Identification Number:	10.1051/0004-6361:20053944
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Royal Society (Great Britain), Engineering and Physical Sciences Research Council (EPSRC), Leverhulme Trust (LT), Rossiĭskiĭ fond fundamentalʼnykh issledovaniĭ [Russian Foundation for Basic Research] (RFFI)
Grant number:	04-02-39029 (RFFI), 04-02-16753 (RFFI), GR/R77940/1 (EPSRC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/3573

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