Computer Science – Sound
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391l.109s&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 391, no. 2, June 1, 1992, p. L109-L112.
Computer Science
Sound
69
Acoustic Attenuation, Coupled Modes, Solar Magnetic Field, Sound Waves, Sunspots, Field Strength, Propagation Modes, Solar Atmosphere
Scientific paper
The study considers the possibility that the acoustic absorption by sunspots and the surrounding plage, reported by Braun et al. (1988, 1990), is a consequence of the conversion of p-modes to slow modes (s-modes) by the principally vertical magnetic fields within these structures. It is found that for the f-mode, the absorption coefficient increases monotonically from small to large horizontal wavenumbers, and, along the nth p-mode ridge, this same general trend is modulated by the presence of n localized absorption minima. These characteristic signatures of acoustic absorption by p-mode/s-mode conversion distinguish this mechanism from other competing processes and afford the diagnostic possibility of determining the sunspot magnetic field strength from the location in wavenumber of the predicted absorption minima.
Bogdan Thomas. J.
Spruit Hendrik C.
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