Viscous magnetohydrodynamic modes and p-mode absorption by sunspots

Details Viscous magnetohydrodynamic modes and p-mode absorption by sunspots Viscous magnetohydrodynamic modes and p-mode absorption by sunspots

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...350..452l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 350, Feb. 10, 1990, p. 452-462.

Astronomy and Astrophysics

Astrophysics

59

Energy Absorption, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Mode Transformers, Solar Oscillations, Sunspots, Photosphere, Plasma Resonance

Scientific paper

Consideration is given to several features of viscous compressible MHD modes in a uniformly magnetized medium and viscous MHD mode conversion in the presence of background inhomogeneity. It is shown that in the presence of the viscous MHD resonance layers, viscous MHD mode conversion can be very effective in absorbing the power of an incident acoustic wave upon an isolated, inhomogeneously magnetized flux tube. Based on this, a possible interpretation for the reported p-mode absorption by sunspots embedded in the solar photosphere is proposed.

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