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Dissipating waves in a hot,compressible, magnetic,structured atmosphere
Authors:G B Laing  P M Edwin
Institution:(1) Department of Mathematical and Computational Sciences, University of St. Andrews, KY16 9SS Fife, Scotland
Abstract:The damping of ducted, fast, magnetohydrodynamic (MHD) waves by ion viscosity and electron heat conduction in a radiating, optically thin, warm, structured atmosphere has been evaluated. Dissipation is more effective in a warm plasma than in a lsquocoldrsquo one but, for waves ducted by solar coronal loops, dissipation is only efficient if the periods of the waves are shorter than a few tens of seconds and only if the background magnetic field is less than about 15 G. It appears that MHD waves of longer periods and in stronger magnetic fields will survive the dissipative mechanisms considered here and may be manifest as observable coronal oscillations.
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