Propagation of waves in an atmosphere in the presence of a magnetic field. IV - Alfven waves in sunspot umbrae

Details Propagation of waves in an atmosphere in the presence of a magnetic field. IV - Alfven waves in sunspot umbrae Propagation of waves in an atmosphere in the presence of a magnetic field. IV - Alfven waves in sunspot umbrae

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...104..203b&link_type=abstract

Astronomy and Astrophysics, vol. 104, no. 2, Dec. 1981, p. 203-206.

Astronomy and Astrophysics

Astrophysics

11

Magnetohydrodynamic Waves, Solar Atmosphere, Sunspots, Umbras, Wave Propagation, Atmospheric Models, Flux Density, Solar Corona, Solar Magnetic Field

Scientific paper

The propagation of Alfven waves in a sunspot is studied without the aid of the eikonal approximation. It is found that the outgoing energy flux density reaching the corona is less than 10 to the -5 of the input energy flux density. This shows clearly that the cooling of sunspots by ascending Alfven waves is not possible. In the study, special attention is given to the transmittance of the atmosphere.

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