Physics
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975pepi...10..327r&link_type=abstract
Physics of the Earth and Planetary Interiors, vol. 10, no. 4, Aug. 1975, p. 327-335.
Physics
40
Dynamo Theory, Lunar Magnetic Fields, Paleomagnetism, Remanence, Lunar Core, Lunar Crust, Spherical Shells
Scientific paper
It is proved that if a spherical shell is magnetized in the direction of and proportional to a magnetic field of origin internal to the shell and the magnetizing field later disappears, no magnetic field exists external to the shell. Similarly if a spherical shell is magnetized parallel to and proportional to a magnetic field of external origin and this magnetizing field later disappears, the magnetic field internal to the shell is zero. These theorems are true only if these ideal conditions are met, but are applicable to the interpretation of the natural remanent magnetization of the lunar crust. It is shown that the present absence of a magnetic dipole field of the moon supports the hypothesis that the magnetizing field was of internal origin but does not distinguish whether this was due to a dynamo in the lunar core or to a primaeval magnetization of its interior. Local magnetic fields around the moon are interpreted as arising from the departure from sphericity of the shell and large craters.
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