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Alfvén instability in coronal loops with siphon flows

Taroyan, Y. (2009) Alfvén instability in coronal loops with siphon flows. Astrophysical Journal , 694. pp. 69-75. ISSN 0004-637X

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Abstract

A new magnetohydrodynamic (MHD) instability in coronal loops is presented. It is demonstrated that small-amplitude torsional Alfvénic disturbances generated by random photospheric motions are inevitably amplified in asymmetrically stratified loops with siphon flows. The loop asymmetry and the flow speeds can be arbitrarily small. The growth rates linked with the instability increase with increasing flow speeds. The instability is caused by over-reflection of Alfvén waves at the transition region where steep variations in density exist.

Item Type: Article
Keywords: instabilities; MHD; Sun: atmosphere
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield)
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Depositing User: Mrs Megan Hobbs
Date Deposited: 29 Mar 2010 13:56
Last Modified: 07 Jun 2010 11:10
Published Version: http://dx.doi.org/10.1088/0004-637X/694/1/69
Status: Published
Publisher: American Astronomical Society
Identification Number: 10.1088/0004-637X/694/1/69
URI: http://eprints.whiterose.ac.uk/id/eprint/10669

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