Physics
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976moon...15...67s&link_type=abstract
The Moon, vol. 15, Jan.-Feb. 1976, p. 67-81.
Physics
4
Dipole Moments, Lunar Evolution, Lunar Magnetic Fields, Magnetic Dipoles, Curie Temperature, Lunar Crust, Lunar Rocks, Magnetization, Remanence
Scientific paper
The residual dipole moment of the outer spherical shell of the moon, magnetized in the field of an internal dipole, is calculated for the case where the permeability of the shell differs from unity. It is shown that, using an average value of surface magnetization from returned lunar crystalline rock samples and a global figure of 1.012 for the lunar permeability, that a residual moment of the order of between 10 to the 15th power and 10 to the 16th power sq Am is expected. This value is some two or three orders of magnitude lower than the moment for a shell magnetized in an external uniform field and is of the same order as the upper limit of the residual moment detected by Russell et al. (1974). At present, the magnetic data and the thermal state of the moon are not known with sufficient accuracy to distinguish between a crust magnetized in an internal dipole field of constant polarity and a crust magnetized in the dipole field of a self-reversing core dynamo.
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