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.

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.286..305y&link_type=abstract

Symposium on Seismology of the Sun and Sun-Like Stars, ESA SP-286, p. 305 - 310

Physics

Magnetohydrodynamics: Sunspots, Magnetohydrodynamics: Solar Atmosphere, Magnetohydrodynamics: Solar Oscillations

Scientific paper

The author investigates properties of small compressible magnetohydrodynamic (MHD) perturbations in the presence of viscosities. Background physical variables in static equilibrium are assumed to vary continuously only with radial coordinate in cylindrical geometry. The well-known ideal MHD singularities are removed by viscosities. He discusses novel features of viscous MHD modes and the viscous diffusive mode conversion process can be very effective in the presence of MHD singular layers. The author suggests a possible mechanism relevant to the observed p-mode absorption by sunspots in the solar atmosphere. An upper limit for "turbulent viscosity" is inferred from the observed linewidths of p-modes.

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