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- W2050477029 abstract "view Abstract Citations (101) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Conversion of p-Modes to Slow Modes and the Absorption of Acoustic Waves by Sunspots Spruit, H. C. ; Bogdan, T. J. Abstract 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. Publication: The Astrophysical Journal Pub Date: June 1992 DOI: 10.1086/186409 Bibcode: 1992ApJ...391L.109S Keywords: Acoustic Attenuation; Coupled Modes; Solar Magnetic Field; Sound Waves; Sunspots; Field Strength; Propagation Modes; Solar Atmosphere; Solar Physics; MAGNETOHYDRODYNAMICS: MHD; SUN: MAGNETIC FIELDS; SUN: OSCILLATIONS; SUN: SUNSPOTS full text sources ADS |" @default.
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- W2050477029 title "The conversion of p-modes to slow modes and the absorption of acoustic waves by sunspots" @default.
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