The effect of finite electrical conductivity on compressible magnetoconvection

Details The effect of finite electrical conductivity on compressible magnetoconvection The effect of finite electrical conductivity on compressible magnetoconvection

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.152...15p&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 152, no. 1, Feb. 1989, p. 15-27.

Computer Science

Numerical Analysis

1

Convection, Electrical Resistivity, Solar Atmosphere, Solar Magnetic Field, Magnetic Diffusion, Modes, Numerical Analysis, Sunspots

Scientific paper

The stability of a polytropic fluid layer in the presence of a uniform vertical magnetic field is investigated for the case of the combined influence of thermal and magnetic diffusion. Special attention is given to the stability of hydromagnetic modes which are believed to be important in the sunspot phenomenon. It is found that finite electrical conductivity produces a destabilizing effect on the convective modes, and that small-scale convection can occur in the presence of a strong magnetic field if the magnetic diffusivity is larger than the thermal diffusivity. It is noted, however, that the magnetic diffusivity has a tendency to stabilize the fast, slow, and Alfven modes.

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