The absorption of p-modes by sunspots - Variations with degree and order

Details The absorption of p-modes by sunspots - Variations with degree and order The absorption of p-modes by sunspots - Variations with degree and order

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406..723b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 2, p. 723-734.

Astronomy and Astrophysics

Astrophysics

75

Absorptivity, Solar Oscillations, Sunspots, Wave Attenuation, Acoustic Scattering, Helioseismology, Power Spectra

Scientific paper

A spherical harmonic decomposition of the p-modes into inward and outward propagating waves is employed to investigate the absorption of solar p-modes by an isolated sunspot. The absorption coefficient (averaged over frequency and azimuthal order) is found to increase with increasing horizontal wavenumber k over the range 0-0.8/Mm. For larger horizontal wavenumbers, in the range 0.8-1.5/Mm, the absorption coefficient decreases with increasing k. The absorption along each individual p-mode ridge tends to peak at an intermediate value of the spherical harmonic degree in the range 200-400. The highest absorption is found along the p(1) ridge, and the absorption decreases with increasing radial order.

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