Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225..275t&link_type=abstract
Astrophysical Journal, Part 1, vol. 225, Oct. 1, 1978, p. 275-280.
Astronomy and Astrophysics
Astrophysics
34
Magnetohydrodynamic Waves, Radiant Cooling, Stellar Models, Sunspots, Wave Reflection, Chromosphere, Photosphere, Solar Interior, Stellar Magnetic Fields, Umbras, Vertical Distribution
Scientific paper
As one means of evaluating the possibility that sunspots are cooled by a flux of Alfven waves, the reflection of vertically propagating Alfven waves in a three-layer model of a sunspot umbra is studied. The results show strong downward reflection of Alfven waves in the photosphere and low chromosphere, with very little wave energy penetrating as high as the corona. This is in agreement with recent observations. The model umbra also shows very weak upward reflection of Alfven waves propagating downward into the convection zone. The results suggest that, if sunspots are indeed cooled by Alfven waves, these waves must escape downward into the solar interior.
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