A&A 430, 1109-1118 (2005)
DOI: 10.1051/0004-6361:20041832

Coronal loop oscillations

Calculation of resonantly damped MHD quasi-mode kink oscillations of longitudinally stratified loops

J. Andries¹, M. Goossens¹, J. V. Hollweg², I. Arregui¹ and T. Van Doorsselaere<sup>1

1</sup>  Centre for Plasma Astrophysics, K.U. Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium
    e-mail: jesse.andries@wis.kuleuven.ac.be
²  Space Science Center, and Institute for the Study of Earth, Oceans and Space University of New Hampshire, Durham, UK

(Received 11 August 2004 / Accepted 27 September 2004 )

Abstract
The observed coronal loop oscillations and their damping are often theoretically described by the use of a very simple coronal loop model, viz. a straight, longitudinally invariant, axi-symmetric, and pressureless flux tube with a different density inside and outside of the loop. In this paper we generalize the model by including longitudinal density stratification and we examine how the longitudinal density stratification alters the linear eigenmodes of the system, their oscillation frequencies, and the damping rates by resonant absorption.

Key words: Sun: corona -- Sun: magnetic fields -- Sun: oscillations

© ESO 2005

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