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Title:
Modelling P-Mode Interaction with a Spreading Sunspot Field
Authors:
Cally, Paul; Bogdan, Tom
Affiliation:
AA(Monash University, Australia; and HAO), AB(HAO)
Publication:
SOHO-9 Workshop "Helioseismic Diagnostics of Solar Convection and Activity", Stanford, California, July 12-15, 1999, meeting abstract.
Publication Date:
00/1999
Origin:
AUTHOR
Bibliographic Code:
1999soho....9E..47C

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 interesting interactions take place in the near horizontal "canopy" which may greatly enhance absorption. We present a video which aids in visualizing the interactions.
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