UNSPECIFIED (2006) Fast magnetoacoustic waves in curved coronal loops - I. Trapped and leaky modes. ASTRONOMY & ASTROPHYSICS, 446 (3). pp. 1139-1149. doi:10.1051/0004-6361:20053955 ISSN 0004-6361.

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Abstract

A study of vertically polarised fast magnetoacoustic waves in a curved coronal loop is presented. The loop is modeled as a semi-circular magnetic slab in the zero plasma-beta limit. The governing equations for linear waves are derived. We show that the wave mode behaviour depends on the slope of the equilibrium density profile, which is modeled as a piece-wise continuous power law curve of index a. For all profiles, except for alpha = -4, wave modes are not trapped in the loop and leak out into the external medium through wave tunneling. The particular case of alpha = -4, which corresponds to a linearly increasing Alfven speed profile, is examined in more detail as this is the only model that can support trapped wave modes. We compare the results with a straight slab model and find similar behaviour. Coupling between sausage and kink wave modes has not been found in the model.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Journal or Publication Title:	ASTRONOMY & ASTROPHYSICS
Publisher:	EDP SCIENCES S A
ISSN:	0004-6361
Official Date:	February 2006
Dates:	Date Event February 2006 UNSPECIFIED
Volume:	446
Number:	3
Number of Pages:	11
Page Range:	pp. 1139-1149
DOI:	10.1051/0004-6361:20053955
Publication Status:	Published

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