Dynamo action of magnetostrophic waves

Details Dynamo action of magnetostrophic waves Dynamo action of magnetostrophic waves

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.220..223s&link_type=abstract

In ESA The Hydromagnetics of the Sun p 223-224 (SEE N85-25091 14-92)

Physics

9

Dynamo Theory, Earth Magnetosphere, Magnetohydrodynamic Waves, Solar Atmosphere, Solar Rotation, Atmospheric Stratification, Magnetohydrodynamic Stability, Solar Magnetic Field

Scientific paper

The stability of solar magnetostrophic waves in a horizontal thin plane layer of a perfectly conducting fluid, which is stratified according to gravitation and permeated by a variable toroidal magnetic field is considered. The layer rotates rigidly around an axis inclined to the horizontal plane. It is shown that unstable magnetostrophic waves, driven by magnetic buoyancy, are capable of inducing an electromotive force parallel to the toroidal magnetic field. This dynamical effect is an alternative to the kinematical alpha effect and of importance for the dynamo theory of intermittent strong magnetic fields. For parameters of the lower solar convection zone the process leads to an effective alpha of a few cm/sec. Dynamo action for various angles of inclination is discussed.

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