Magnetic fields and nonuniform structures of the Moon

Details Magnetic fields and nonuniform structures of the Moon Magnetic fields and nonuniform structures of the Moon

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..411d&link_type=abstract

In its Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 411-412 (SEE N94-12015 01-91)

Physics

Lunar Evolution, Lunar Geology, Lunar Gravitation, Lunar Magnetic Fields, Lunar Rocks, Magnetic Measurement, Paleomagnetism, Crystallization, Lunar Core, Magnetization, Meteoroids, Space Probes

Scientific paper

Direct magnetic measurements performed by space probes demonstrated the existence of small-scale, stationary surface magnetic fields on the Moon. The magnetic field averaged over a region of approximately 600 km was found to be no larger than approximately 10-5 G, that of the regions approximately 100-200 km is approximately 10-5 to 10-4 G, and that of approximately 10-100 km reaches approximately 10-3 G. Investigations of certain lunar rocks reveal stable residual magnetization, which could have been acquired during the crystallization of the rocks in the presence of the outer magnetic field, provided such a field existed at the initial stage of lunar evolution. Estimates show that 4 x 109 yr ago the field was small, then it rose to approximately 1.3 G at the beginning of 3.9 x 109 yr with a subsequent exponential decrease during the period of 3.9 x 109 yr to 3.2 x 109 yr ago. Small-scale fields have been explained by some authors as due to mechanical impacts produced by meteors. The theory of this effect is not elaborated in detail. This can in no way explain the paleomagnetic data. These data are commonly explained as a result of the dynamo action in the liquid lunar core.

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