Phase-Mixing and Dissipation of Standing Shear Alfvén Waves

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Contents Vol 26(4)

doi:10.1071/AS09019

Phase-Mixing and Dissipation of Standing Shear Alfvén Waves

K. Karami ^A ^B ^C, Z. Ebrahimi ^A

^A Department of Physics, University of Kurdistan, Pasdaran St., PO Box 66177-15175, Sanandaj, Iran
^B Research Institute for Astronomy & Astrophysics of Maragha (RIAAM), PO Box 55134-441, Maragha, Iran
^C Corresponding author. Email: kkarami@uok.ac.ir





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Publications of the Astronomical Society of Australia 26(4) 448–453 http://dx.doi.org/10.1071/AS09019
Submitted: 12 May 2009 Accepted: 7 July 2009 Published online: 4 November 2009

Abstract

We study the phase mixing and dissipation of a packet of standing shear Alfvén waves localized in a region with non-uniform Alfvén background velocity. We investigate the validity of the exponential damping law in time, exp (–At³), presented by Heyvaerts & Priest (1983) for different ranges of Lundquist, S, and Reynolds, R, numbers. Our numerical results shows that it is valid for (R,S) ≥ 10⁷.

Keywords: sun: corona — sun: magnetic fields — sun: oscillations