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Title:
Modelling p-Mode Interaction with a Spreading Sunspot Field
Authors:
Cally, P. S.
Affiliation:
AA(Department of Mathematics and Statistics, Monash University, PO Box 28M, Victoria 3800, Australia, and High Altitude Observatory, National Center for Atmospheric Research, PO Box 3000, Boulder, CO 80307, U.S.A. ())
Publication:
Solar Physics, v. 192, Issue 1/2, p. 395-401 (2000). (SoPh Homepage)
Publication Date:
03/2000
Origin:
KLUWER
Bibliographic Code:
2000SoPh..192..395C

Abstract

Sunspots absorb and scatter incident p modes. The dominant mechanism is still uncertain. One possibility, mode conversion to slow magneto-acoustic waves, has been shown to yield results in agreement with observations for the f mode only. Absorption of p modes in simple vertical magnetic field models is too weak by an order of magnitude or more. Here we report on numerical calculations of p modes encountering a simple sunspot model with field which spreads with height. It is found that p-mode absorption is greatly enhanced by field spread, to a level consistent with observations, and it appears that it occurs preferentially in the outer regions of the spot, in line with recent results from acoustic holography.
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Database: Astronomy
Physics
arXiv e-prints