Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974moon...10..323a&link_type=abstract
The Moon, vol. 10, July-Aug. 1974, p. 323-335.
Astronomy and Astrophysics
Astronomy
3
Astronomical Models, Earth-Moon System, Geomagnetism, Lunar Magnetic Fields, Magnetization, Dynamo Theory, Earth Core, Earth Mantle, Lunar Evolution, Lunar Rocks, Magnetic Field Configurations, Paleomagnetism, Planetary Evolution
Scientific paper
A model of the earth as a sphere with a liquid core surrounded by a solid mantle is considered. It is assumed that constant azimuthal currents flowing symmetric to the axis in the core produce a poloidal magnetic field which at the surface is observed as a dipole field. Effects of differences in the angular velocity of the core and the mantle are examined, giving attention to unipolar induction phenomena. The significance of the kink instability is discussed along with a plasma ring experiment, experimental evidence of magnetic flux amplification, the condition for instability, the critical differential angular velocity, questions of coupling between lunar motions and magnetic field, and a numerical estimate of the magnetic field of the primeval earth and moon.
Alfvén Hannes
Lindberg Lennart
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