Fast magnetoacoustic waves in curved coronal loops

Details Fast magnetoacoustic waves in curved coronal loops Fast magnetoacoustic waves in curved coronal loops

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...446.1139v&link_type=abstract

Astronomy and Astrophysics, Volume 446, Issue 3, February II 2006, pp.1139-1149

Astronomy and Astrophysics

Astrophysics

35

Sun: Oscillations, Magnetohydrodynamics (Mhd)

Scientific paper

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-β 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 α. For all profiles, except for α=-4, wave modes are not trapped in the loop and leak out into the external medium through wave tunneling. The particular case of α=-4, which corresponds to a linearly increasing Alfvén 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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