Total resonant absorption of acoustic oscillations in sunspots

Details Total resonant absorption of acoustic oscillations in sunspots Total resonant absorption of acoustic oscillations in sunspots

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..147...13s&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 147, no. 1, p. 13-28.

Physics

22

Acoustic Attenuation, Magnetoacoustic Waves, Magnetohydrodynamics, Sunspots, Boundary Conditions, Equilibrium Equations, Hydrodynamic Equations, Resonance

Scientific paper

The question of total resonant absorption of acoustic oscillations in sunspots is studied for cylindrical 1-D flux tubes that are stratified only in the radial direction and surrounded by a uniform, non-magnetic plasma. The numerical investigation of Goossens and Poedts (1992) in linear resistive MHD is taken further by increasing the strength of the azimuthal magnetic field in the equilibrium flux tubes. For relatively strong azimuthal magnetic fields, total absorption is found over a relatively wide range of spot radii.

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