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Acoustic oscillations in solar and stellar flaring loops

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Nakariakov, Valery M., Tsiklauri, D., Kelly, A. (Adam), Arber, T. D. and Aschwanden, Markus J.. (2004) Acoustic oscillations in solar and stellar flaring loops. Astronomy & Astrophysics, Vol.414 (No.2). L25-L28. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361:20031738

Abstract

Evolution of a coronal loop in response to an impulsive energy release is numerically modelled. It is shown that the loop density evolution curves exhibit quasi-periodic perturbations with the periods given approximately by the ratio of the loop length to the average sound speed, associated with the second standing harmonics of an acoustic wave. The density perturbations have a maximum near the loop apex. The corresponding field-aligned flows have a node near the apex. We suggest that the quasi-periodic pulsations with periods in the range 10-300 s, frequently observed in flaring coronal loops in the radio, visible light and X-ray bands, may be produced by the second standing harmonic of the acoustic mode.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Sun -- Loop prominences, Sun -- Corona, Solar oscillations, Stellar oscillations, Stars -- Corona
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	February 2004
Volume:	Vol.414
Number:	No.2
Page Range:	L25-L28
Identification Number:	10.1051/0004-6361:20031738
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC), Particle Physics and Astronomy Research Council (Great Britain) (PPARC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/3803