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On the vertical and horizontal transverse oscillations of curved coronal loops

Ruderman, M.S. (2009) On the vertical and horizontal transverse oscillations of curved coronal loops. Astronomy and Astrophysics, 506 (2). pp. 885-893. ISSN 0004-6361

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Abstract

Kink oscillations of curved coronal loops with the density varying along the loop are studied in the thin tube approximation. The equilibrium magnetic field is assumed to be potential, and the field potential and flux function are used as curvilinear coordinates. It is also assumed that the loop expansion is weak, and the solution to the problem is looked for in the form of power series with respect to the tube expansion parameter lambda << 1. The main result of the study is that the eigenfrequencies of the vertical and horizontal tube oscillations are, in general, different, their difference being proportional to lambda. As an example a simple equilibrium with the magnetic field magnitude exponentially decaying with the height is considered. The implication of the obtained results for the interpretation of observational data is discussed.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 EDP Sciences. Reproduced in accordance with the publisher's self-archiving policy.
Keywords: magnetohydrodynamics (MHD); waves; Sun: oscillations; Sun: corona
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 17 Nov 2009 10:42
Last Modified: 08 Jun 2014 18:55
Published Version: http://dx.doi.org/10.1051/0004-6361/200912652
Status: Published
Publisher: EDP Sciences
Refereed: Yes
Identification Number: 10.1051/0004-6361/200912652
URI: http://eprints.whiterose.ac.uk/id/eprint/10138

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