Resonantly Damped Surface and Body MHD Waves in a Solar Coronal Slab with Oblique Propagation |
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| Authors: | I Arregui J Terradas R Oliver J L Ballester |
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| Institution: | (1) Departament de Física, Universitat de les Illes Balears, 07122 Palma de Mallorca, Spain;(2) Centrum voor Plasma Astrofysica, Katholieke Universiteit Leuven, Celestijnenlaan 200B, 3001 Heverlee, Belgium |
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| Abstract: | The theory of magnetohydrodynamic (MHD) waves in solar coronal slabs in a zero-β configuration and for parallel propagation of waves does not allow the existence of surface waves. When oblique propagation
of perturbations is considered, both surface and body waves are able to propagate. When the perpendicular wavenumber is larger
than a certain value, the body kink mode becomes a surface wave. In addition, a sausage surface mode is found below the internal
cutoff frequency. When nonuniformity in the equilibrium is included, surface and body modes are damped by resonant absorption.
In this paper, first, a normal-mode analysis is performed and the period, the damping rate, and the spatial structure of the
eigenfunctions are obtained. Then, the time-dependent problem is solved, and the conditions under which one or the other type
of mode is excited are investigated. |
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| Keywords: | Magnetohydrodynamics Waves: propagation Coronal seismology |
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