Journal
ASTRONOMY & ASTROPHYSICS
Volume 446, Issue 3, Pages 1139-1149Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20053955
Keywords
sun : oscillations; magnetohydrodynamics (MHD)
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Funding
- EPSRC [EP/D062837/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D062837/1] Funding Source: researchfish
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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.
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