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Fast magnetoacoustic waves in curved coronal loops. I, Trapped and leaky modes
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Verwichte, E. (Erwin), Foullon, C. (Claire) and Nakariakov, V. M. (Valery M.) (2006) Fast magnetoacoustic waves in curved coronal loops. I, Trapped and leaky modes. Astronomy & Astrophysics, Vol.446 (No.3). pp. 1139-1149. doi:10.1051/0004-6361:20053955 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361:20053955
Abstract
A study of vertically polarised fast magnetoacoustic waves in a curved coronal loop is presented. The loop is modeled as a semi-circular magnetic slab in the zero plasma-β limit. The governing equations for linear waves are derived. We show that the wave mode behaviour depends on the slope of the equilibrium density profile, which is modeled as a piece-wise continuous power law curve of index α. For all profiles, except for α = −4, wave modes are not trapped in the loop and leak out into the external medium through wave tunneling. The particular case of α = −4, which corresponds to a linearly increasing Alfvén speed profile, is examined in more detail as this is the only model that can support trapped wave modes. We compare the results with a straight slab model and find similar behaviour. Coupling between sausage and kink wave modes has not been found in the model.
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): | Magnetohydrodynamics, Sun -- Loop prominences, Sun -- Corona, Solar oscillations | ||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||
Publisher: | EDP Sciences | ||||
ISSN: | 0004-6361 | ||||
Official Date: | February 2006 | ||||
Dates: |
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Volume: | Vol.446 | ||||
Number: | No.3 | ||||
Page Range: | pp. 1139-1149 | ||||
DOI: | 10.1051/0004-6361:20053955 | ||||
Status: | Peer Reviewed | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Funder: | Royal Society (Great Britain), Leverhulme Trust (LT), Particle Physics and Astronomy Research Council (Great Britain) (PPARC) |
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