Alfven wave propagation in a density gradient in sunspots

Details Alfven wave propagation in a density gradient in sunspots Alfven wave propagation in a density gradient in sunspots

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...211..966g&link_type=abstract

Astrophysical Journal, Part 1, vol. 211, Feb. 1, 1977, p. 966-971.

Astronomy and Astrophysics

Astrophysics

9

Density Distribution, Magnetohydrodynamic Waves, Sunspots, Thermomagnetic Cooling, Wave Propagation, Wave Reflection, Astronomical Models, Convective Flow, Energy Transfer, Motion Stability, Photosphere, Radiative Transfer, Solar Magnetic Field, Wave Equations

Scientific paper

In view of the possible generation of Alfven waves in sunspots, a
calculation is presented which estimates the ratio of the upward to the
downward Alfven-wave flux in sunspots. Only a slight downward
preferential propagation is found, so that sufficient Alfven cooling
predicts high turbulent umbral velocities, of the order of 3 km/s.

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