Computer Science – Sound
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...434..795j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 434, no. 2, p. 795-800
Computer Science
Sound
33
Acoustic Frequencies, P Waves, Solar Atmosphere, Solar Interior, Solar Oscillations, Sound Waves, Transit Time, Approximation, Photosphere, Solar Convection (Astronomy)
Scientific paper
The variation of solar p-mode travel times with cyclic frequency nu is shown to provide information on both the radial variation of the acoustic potential and the depth of the effective source of the oscillations. Observed travel-time data for waves with frequency lower than the acoustic cutoff frequency for the solar atmosphere (approximately equals 5.5 mHz) are inverted to yield the local acoustic cutoff frequency nuc as a function of depth in the outer convection zone and lower atmosphere of the Sun. The data for waves with nu greater than 5.5 mHz are used to show that the source of the p-mode oscillations lies approximately 100 km beneath the base of the photosphere. This depth is deeper than that determined using a standard mixing-length calculation.
Duvall Thomas L. Jr.
Harvey Jack W.
Jefferies Stuart M.
Osaki Yoji
Pomerantz Marin A.
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