Fast magnetoacoustic waves in curved coronal loops
I. Trapped and leaky modesE. Verwichte, C. Foullon and V. M. Nakariakov
Department of Physics, University of Warwick, Coventry CV4 7AL, UK
(Received 1 August 2005 / Accepted 15 September 2005 )
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- 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 . For all profiles, except for , wave modes are not trapped in the loop and leak out into the external medium through wave tunneling.
Key words: Sun: oscillations -- magnetohydrodynamics (MHD)
© ESO 2006