Sausage Mode Propagation in a Thick Magnetic Flux Tube
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The aim of this paper is to model the propagation of slow magnetohydrodynamic (MHD) sausage waves in a thick expanding magnetic flux tube in the context of the quiescent (VAL-C) solar atmosphere. The propagation of these waves is found to be described by the Klein–Gordon equation. Using the governing MHD equations and the VAL-C atmosphere model we study the variation of the cut-off frequency along and across the magnetic tube guiding the waves. Due to the radial variation of the cut-off frequency the flux tubes act as low frequency filters for the waves.
KeywordsMagnetohydrodynamics (MHD) Sun, waves
The present study was completed while one of us (AP) visited the Solar Physics and Space Plasma Research Centre (SP2RC) at the University of Sheffield. IB was financially supported by NFS Hungary (OTKA, K83133).
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