Computer Science – Sound
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..139...25r&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 139, no. 1, May 1992, p. 25-45. Research supported by NASA.
Computer Science
Sound
12
Acoustic Attenuation, Solar Magnetic Field, Sound Waves, Stellar Models, Sunspots, Acoustic Scattering, Solar Activity Effects, Solar Atmosphere
Scientific paper
Analytical calculations of acoustic waves scattered by sunspots which concentrate on the absorption at the magnetohydrodynamic Alfven resonance are extended to the case of a flux-tube embedded in a uniform atmosphere. The model is based on a flux-tubes of varying radius that are highly structured, translationally invariant, and axisymmetric. The absorbed fractional energy is determined for different flux-densities and subphotospheric locations with attention given to the effects of twist. When the flux is highly concentrated into annuli efficient absorption is possible even when the mean magnetic flux density is low. The model demonstrates low absorption at low azimuthal orders even in the presence of twist which generally increases the range of wave numbers over which efficient absorption can occur. Resonance absorption is concluded to be an efficient mechanism in monolithic sunspots, fibril sunspots, and plage fields.
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