Resonance absorption of solar p-modes by sunspots

Braun et al. (1987) observation that the power in outgoing p-modes in the vicinity of sunspots is less than that incoming has prompted the present consideration of the possibility that this deficit is due to resonance absorption occurring when the sunspot boundary has nonzero thickness. A simple planar analysis is used to characterize the requisite conditions for this effect, and to estimate the absorption coefficient. It is found that the resonance absorption effect is unlikely to explain the substantial loss of p-mode power observed over a substantial range of frequency and azimuthal order. 37 references