Computer Science – Sound
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.0711c&link_type=abstract
American Astronomical Society, SPD meeting #40, #7.11; Bulletin of the American Astronomical Society, Vol. 41, p.814
Computer Science
Sound
Scientific paper
We model the interaction of solar p-modes with uniform, inclined magnetic fields and study the effects of MHD mode conversion. Inside strongly magnetized regions like sunspots the fast and slow magnetoacoustic-gravity waves and Alfven waves are coupled, primarily in the region where the sound and Alfven speeds coincide. Away from this region, the fast wave is vertically trapped but travels horizontally at a speed in excess of the quiet-Sun sound speed, which results in a phase shift for p-modes interacting with sunspots. The slow and Alfven waves propagate along the magnetic field, carrying energy away from the trapped component which leads to the absorption of p-modes by sunspots. We model both of these effects, and furthermore, we compute the wave energy flux of Alfven and slow waves that travel into both the solar interior and atmosphere above sunspots. This work is supported by NASA contracts NNH09CE41C and NNG07EI51C.
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