Physics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..130..313r&link_type=abstract
(Committee of European Radio Astronomers, SNSF, URSI, et al., Workshop on Particle Beams in the Solar Atmosphere, Braunwald, Swi
Physics
13
Acoustic Attenuation, Magnetic Field Configurations, Magnetohydrodynamic Waves, Sunspots, Computerized Simulation, P Waves, Solar Magnetic Field, Stellar Models
Scientific paper
The mechanism responsible for the substantial absorption of acoustic power in the vicinity of sunspots, which has been attributed by some authors to the transformation of acoustic oscillations into highly damped shear Alfven waves in thin resonant layers, is investigated. Hollweg's (1988) analytical estimates of the efficiency of this process are compared with direct one-dimensional numerical simulations of absorption by a magnetic barrier in a viscous medium. It is found that the estimates give a good approximation to the numerical absorption rate. Calculations performed for the scattering from a magnetic field of a fibril structure showed that fibril models produce a more plausible explanation for the observed p-mode scattered power deficit than the resonant absorption produced by a monolithic structure.
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