Enhanced absorption of p-modes on sunspot and plage regions

Details Enhanced absorption of p-modes on sunspot and plage regions Enhanced absorption of p-modes on sunspot and plage regions

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ppcn.conf..275l&link_type=abstract

In ESA, Fourth International Toki Conference on Plasma Physics and Controlled Nuclear Fusion p 275-278 (SEE N94-22624 05-75)

Computer Science

Sound

Magnetic Field Configurations, Sound Waves, Sunspots, Wave Propagation, Inhomogeneity, Landau Damping, Magnetohydrodynamic Waves, Plasma Density, Plasma Pressure, Solar Flares

Scientific paper

A mechanism for the enhanced absorption of p modes is presented. It is based on the idea that in sunspots the magnetic field has a fine filamentary structure. Magnetic regions on the Sun's surface are observed to absorb large fractions of the p mode (acoustic) wave power incident upon them. Strong gradients in the (perturbed) parameters of a wave propagating through such an inhomogeneous medium result in enhanced absorption of the wave power. The gradients in the wave parameters occur on the scale of the background flux tubes which is smaller than the wavelength.

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