The reflection of Alfven waves and the cooling of sunspots

Details The reflection of Alfven waves and the cooling of sunspots The reflection of Alfven waves and the cooling of sunspots

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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