Other
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.547...15c&link_type=abstract
Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO a
Other
3
Scientific paper
Sunspots absorb and scatter the sun's global modes, the fand p-modes. Initial hopes were that this would allow us to probe the subsurface structure of spots, as helioseismology has been probing the sun on a global scale. However, it has turned out to be more difficult than first imagined. At the INTAS Workshop on MHD Waves in Mallorca in 2001, I explained the supposed mechanism, coupling to slow magnetoacoustic waves, but gave a rather gloomy picture of its ability to quantitatively match observations. However, recent advances in modelling in CSPA at Monash have for the first time produced results which seem to explain much of the data. In this talk, a simple model is presented, and its predictions compared with the best available observational Hankel data. Discrepancies concerning near-surface wave speeds between Hankel and holographic analyses on the one hand and time-distance inversions on the other are discussed. It is suggested that helioseismic inversions of active regions should address magneto-acoustic mode coupling if they are to fully account for absorption and wave speed variations.
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