Effect of gravity on the fast modes of a horizontal coronal slab

McEwan, M.P. and Diaz, A.J. (2007) Effect of gravity on the fast modes of a horizontal coronal slab. Solar Physics, 246(1), pp. 243-257. (doi: 10.1007/s11207-007-0395-3)

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Abstract

Theoretical studies of the normal modes of a coronal slab often neglect gravity, as in Edwin and Roberts (Solar Phys. 71, 239, 1982). Here we study analytically the effect of gravity acting on a horizontal slab as a first step away from a homogeneous medium. Because of the inclusion of gravity, the symmetry of a homogeneous slab is lost, so the normal modes cannot be classified into kink and sausage modes. The presence of gravity also modifies the oscillatory frequencies of the slab, as well as the lower cutoff frequency, resulting in the possible transition between surface and body modes. For general coronal parameters, the dimensionless gravity term turns out to be small, so these effects are also small.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:McEwan, Dr Michael
Authors: McEwan, M.P., and Diaz, A.J.
College/School:University Services > Learning and Teaching Services Division
Journal Name:Solar Physics
Publisher:Springer
ISSN:1573-093X
ISSN (Online):1573-093X

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