The absorption of high-degree p-mode oscillations in and around sunspots

Details The absorption of high-degree p-mode oscillations in and around sunspots The absorption of high-degree p-mode oscillations in and around sunspots

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...335.1015b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 335, Dec. 15, 1988, p. 1015-1025.

Astronomy and Astrophysics

Astrophysics

157

Solar Oscillations, Sunspots, Energy Absorption, Solar Magnetic Field

Scientific paper

The direct interaction of p-modes and sunspots is investigated in four observed active regions using a partial wave analysis in a cylindrical coordinate system centered on the spots. Up to half the power of incident p-modes is absorbed by the sunspots. By measuring the magnitude of absorption as a function of horizontal wavenumber and azimuthal order the authors have determined that the absorption is not only from the umbrae of the spots but is also significant within the penumbrae, and in some cases it appears to be associated with the presence of extended magnetic fields surrounding the sunspots. The amount of p-mode energy removed by magnetic fields is estimated for each of the regions observed.

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