Journal Article

The effect of density stratification on the resonant absorption of MHD waves in coronal loops

K. Karami, S. Nasiri and S. Amiri

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 394, issue 4, pages 1973-1977
Published in print April 2009 | ISSN: 0035-8711
Published online April 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14413.x
The effect of density stratification on the resonant absorption of MHD waves in coronal loops

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The standing quasi-modes of the ideal magnetohydrodynamics (MHD) in a zero-β cylindrical magnetic flux tube that undergoes a longitudinal density stratification and radial density structuring are considered. The radial structuring is assumed to be a linearly varying density profile. Using the relevant connection formulae of the resonant absorption, the dispersion relation for the fast MHD body waves is derived and solved numerically to obtain both the frequencies and damping rates of the fundamental and first-overtone, k= 1, 2, modes of both the kink (m= 1) and fluting (m= 2) waves, where k and m are the longitudinal and azimuthal mode numbers, respectively.

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

Journal Article.  2935 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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