Physics
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993geoae..33...11b&link_type=abstract
Geomagnetizm i Aeronomiya, vol. 33, p. 11
Physics
Planetary Rotation, Magnetopause, Planetary Magnetic Fields, Lines Of Force, Stellar Winds, Dynamo Theory, Plasma Interactions, Planetary Cores
Scientific paper
In the case of interaction between stellar wind and a planet having its own magnetic field, the flow is suddenly decelerated, and a perturbed region in the form of an ionosphere limited by a magnetopause is formed around the planet. If the angular velocity of the planet is high and the ionosphere and the magnetopause are characterized by high integral conductivities, then rotation is imparted to the open lines of force of the magnetic field, resulting in the formation of vortices in the magnetopause region. It is shown that differential rotation may give rise to strong toroidal fields, while poloidal fields may be generated from the toroidal fields due to the alpha effect. If differential rotation and the alpha effect act in the same direction, the total field is amplified at the magnetopause; if they act in the opposite directions, a vibrational dynamo is realized.
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