Total resonant absorption of acoustic oscillations in sunspots |
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Authors: | Hilde Stenuit Stefaan Poedts Marcel Goossens |
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Institution: | (1) Center for Plasma Astrophysics, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium;(2) F.O.M. Instituut voor Plasmafysica, 3430 BE Rijnhuizen, Nieuwegein, The Netherlands |
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Abstract: | The question of total resonant absorption of acoustic oscillations in sunspots is studied for cylindrical 1-D flux tubes that are stratified only in the radial direction and surrounded by a uniform, non-magnetic plasma. The numerical investigation of Goossens and Poedts (1992) in linear resistive MHD is taken further by increasing the strength of the azimuthal magnetic field in the equilibrium flux tubes. For relatively strong azimuthal magnetic fields, total absorption is found over a relatively wide range of spot radii. |
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