Resonantly Damped Surface and Body MHD Waves in a Solar Coronal Slab with Oblique Propagation

Arregui, I.; Terradas, J.; Oliver, R.; Ballester, J. L.
Bibliographical reference

Solar Physics, Volume 246, Issue 1, pp.213-230

Advertised on:
11
2007
Journal
Number of authors
4
IAC number of authors
0
Citations
21
Refereed citations
20
Description
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.
Type