Journal Article

The effects of twisted magnetic field on coronal loop oscillations and dissipation

K. Karami and M. Barin

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 394, issue 1, pages 521-526
Published in print March 2009 | ISSN: 0035-8711
Published online March 2009 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2008.14360.x
The effects of twisted magnetic field on coronal loop oscillations and dissipation

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The standing magnetohydrodynamic (MHD) modes in a cylindrical incompressible magnetic flux tube modelled as a straight core surrounded by a magnetically twisted annulus, both embedded in a straight ambient external field, are considered. The dispersion relation for the MHD waves is derived and solved numerically to obtain the frequencies of both the kink (m= 1) and fluting (m= 2, 3) waves. Damping rates due to both viscous and resistive dissipations in the presence of the twisted magnetic field are derived and solved numerically for both the kink and fluting waves.

Keywords: Sun: corona; Sun: magnetic fields; Sun: oscillations

Journal Article.  3092 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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