Propagation of magnetohydrodynamic waves in the solar atmosphere - Alfven p-waves in sunspots

Details Propagation of magnetohydrodynamic waves in the solar atmosphere - Alfven p-waves in sunspots Propagation of magnetohydrodynamic waves in the solar atmosphere - Alfven p-waves in sunspots

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988basi...16..145z&link_type=abstract

Astronomical Society of India, Bulletin (ISSN 0304-9523), vol. 16, Dec. 1988, p. 145-158.

Physics

2

Magnetohydrodynamic Waves, P Waves, Solar Atmosphere, Sunspots, Wave Propagation, Atmospheric Physics, Coupled Modes, Gravity Waves, Reflected Waves, Umbras

Scientific paper

Numerical calculations are given for the propagation of Alfven p-waves in the solar atmosphere for Geronicolas' (1977) sunspot model. It is shown that Alfven p-waves with a period greater than 400s do not, in fact, penetrate into upper layers of a sunspot. This is due to the reflection of Alfven p-waves from the upper layers and to coupling with magnetogravity waves trapped at a particular layer of a sunspot. Proper resonance periods for magnetogravity waves in a sunspot are calculated.

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