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Acoustic oscillations in solar and stellar flaring loops
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Nakariakov, V. M. (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. doi:10.1051/0004-6361:20031738 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 | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > 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 | ||||
Official Date: | February 2004 | ||||
Dates: |
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Volume: | Vol.414 | ||||
Number: | No.2 | ||||
Page Range: | L25-L28 | ||||
DOI: | 10.1051/0004-6361:20031738 | ||||
Status: | Peer Reviewed | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), Particle Physics and Astronomy Research Council (Great Britain) (PPARC) |
Data sourced from Thomson Reuters' Web of Knowledge
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