Modelling p-Mode Interaction with a Spreading Sunspot Field

Details Modelling p-Mode Interaction with a Spreading Sunspot Field Modelling p-Mode Interaction with a Spreading Sunspot Field

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000soph..192..395c&link_type=abstract

Solar Physics, v. 192, Issue 1/2, p. 395-401 (2000).

Physics

38

Scientific paper

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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