Mode Mixing by a Shallow Sunspot

Details Mode Mixing by a Shallow Sunspot Mode Mixing by a Shallow Sunspot

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000soph..193..373b&link_type=abstract

Solar Physics, v. 193, Issue 1/2, p. 373-382 (2000).

Physics

9

Scientific paper

Sunspots are strong absorbers of f and p modes. A possible absorption mechanism is direct conversion to slow magnetoacoustic waves. Calculations based on vertical magnetic field models show that this works well for f modes, but is inadequate for p modes. Using a very simple `shallow spot' model, in which the effects of the magnetic field are accounted for solely by a surface condition, we investigate the possibility that p modes first scatter into f modes inside the spot, which are then more susceptible to conversion to slow modes. We find that the coupling between an incident p mode and the internal f mode is unlikely to be strong enough to account for the observed absorption, but that the incident modes do couple strongly to the acoustic jacket in some cases, leading to a region immediately around the sunspot where a significant fraction of the surface velocity is due to the jacket modes.

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