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Flare-generated acoustic oscillations in solar and stellar coronal loops
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Tsiklauri, D., Nakariakov, V. M. (Valery M.), Arber, T. D. and Aschwanden, Markus J. (2004) Flare-generated acoustic oscillations in solar and stellar coronal loops. Astronomy & Astrophysics, Vol.422 (No.1). pp. 351-355. doi:10.1051/0004-6361:20040299 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361:20040299
Abstract
Long period longitudinal oscillations of a flaring coronal loop are studied numerically. In the recent work of
Nakariakov et al. (2004) it has been shown that the time dependence of density and velocity in a flaring loop contain pronounced quasi-harmonic oscillations associated with the 2nd harmonic of a standing slow magnetoacoustic wave. In this work we investigate the physical nature of these oscillations in greater detail, namely, their spectrum (using the periodogram technique) and how heat positioning affects mode excitation. We found that excitation of such oscillations is practically independent
of the location of the heat deposition in the loop. Because of the change of the background temperature and density, the phase shift between the density and velocity perturbations is not exactly a quarter of the period; it varies along the loop and is time dependent, especially in the case of one footpoint (asymmetric) heating.
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): | Solar flares, Stellar oscillations, Sun -- Corona, Stars -- Corona | ||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||
Publisher: | EDP Sciences | ||||
ISSN: | 0004-6361 | ||||
Official Date: | July 2004 | ||||
Dates: |
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Volume: | Vol.422 | ||||
Number: | No.1 | ||||
Page Range: | pp. 351-355 | ||||
DOI: | 10.1051/0004-6361:20040299 | ||||
Status: | Peer Reviewed | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Funder: | Particle Physics and Astronomy Research Council (Great Britain) (PPARC), Nuffield Foundation (NF) | ||||
Grant number: | NUF-NAL 04 (Nuffield) |
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