The interaction of solar p-modes with a sunspot. II - Simple theoretical models

Details The interaction of solar p-modes with a sunspot. II - Simple theoretical models The interaction of solar p-modes with a sunspot. II - Simple theoretical models

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...320..884a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 320, Sept. 15, 1987, p. 884-892.

Astronomy and Astrophysics

Astrophysics

28

Magnetohydrodynamics, Solar Oscillations, Sunspots, Magnetic Flux, Magnetoacoustic Waves, Power Spectra, Umbras, Wave Propagation

Scientific paper

The interaction of solar p-modes with a sunspot magnetic flux tube is investigated theoretically by means of two simple models. An increase in horizontal wavelength between the nonmagnetic and magnetic regions, due to the different characteristic wave speeds in the two regions, explains the corresponding observed wavelength shift of powe in the umbral k-omega power spectrum. The variation of the transmission coefficient with wavenumber along the p-mode diagnostic curves, due to resonant transmission, is responsible for the observed selective filtering of the p-modes by the sunspot.

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