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The role of magnetic fields in the scattering of p-modes

Gascoyne, A. and Jain, R. (2009) The role of magnetic fields in the scattering of p-modes. Astronomy and Astrophysics, 501 (3). pp. 1131-1137. ISSN 0004-6361

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Abstract

Aims. We determine the direct and indirect effects of magnetic field on p-mode scattering.

Methods. We solve a set of magnetohydrodynamic equations using the Born approximation to determine phase shifts in p-modes due to a region of inhomogeneity. The region of inhomogeneity is a magnetic flux tube with the characteristics of flaring field lines. This enables us to investigate the magnetic field effects on the phase shifts.

Results. The magnetic configuration of our flux tube model plays a vital role in the phase shifts of p-modes. The suppression of sound speed and pressure within the flux tube region is not the only factor to consider in the scattering of p-modes. There is a direct effect of the magnetic fields caused by the flaring of field lines on phase shifts.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 EDP Sciences. Reproduced in accordance with the publisher's self-archiving policy
Keywords: sun: magnetic fields; sun: helioseismology; sun: oscillations; magnetohydrodynamics (MHD); scattering
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: 10 Aug 2009 15:40
Last Modified: 08 Jun 2014 20:05
Published Version: http://dx.doi.org/10.1051/0004-6361/200911711
Status: Published
Publisher: EDP Sciences
Refereed: Yes
Identification Number: 10.1051/0004-6361/200911711
URI: http://eprints.whiterose.ac.uk/id/eprint/9073

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