Skip to main content
Article thumbnail
Location of Repository

Fast magnetoacoustic waves in curved coronal loops. I, Trapped and leaky modes \ud

By E. (Erwin) Verwichte, C. (Claire) Foullon and V. M. (Valery M.) Nakariakov


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.\u

Topics: QB
Publisher: EDP Sciences
Year: 2006
OAI identifier:

Suggested articles


  1. (2004). Living Rev.

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.