The primaeval lunar magnetic field - Its relevance to the interpretation of planetary fields

Physics

Scientific paper

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Dynamo Theory, Lunar Magnetic Fields, Paleomagnetism, Planetary Magnetic Fields, Remanence, Gas Giant Planets, Geomagnetism, Lunar Core, Magnetic Anomalies, Magnetic Dipoles, Magnetic Flux, Planetary Evolution, Terrestrial Planets

Scientific paper

An overview is given regarding the evidence that the moon once had a general magnetic field, and its implications are considered with respect to planets such as Mars, Venus, Uranus, and Neptune. Attention is given to evidence of remanent magnetization in lunar samples, and satellite magnetic surveys are discussed. It is argued that planetary field strengths vary with evolutionary factors and that 'scaling laws' are inappropriate for interpreting planetary fields. The idea is considered that the dynamos of Mars and Venus may have shut down as in the case of the moon, and the off-center dipoles of Uranus and Neptune suggest the presence of local dynamos. It is proposed that the dipole inclinations of Uranus and Neptune can be explained by local dipoles that align along the angular rotation component perpendicular to the shell.

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