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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. ISSN 0004-6361

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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
Subjects: Q Science > QB Astronomy
Divisions: Faculty of 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
Volume: Vol.446
Number: No.3
Page Range: pp. 1139-1149
Identification Number: 10.1051/0004-6361:20053955
Status: Peer Reviewed
Access rights to Published version: Open Access
Funder: Royal Society (Great Britain), Leverhulme Trust (LT), Particle Physics and Astronomy Research Council (Great Britain) (PPARC)
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URI: http://wrap.warwick.ac.uk/id/eprint/3571

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