On the intensity of the ancient lunar magnetic field

Details On the intensity of the ancient lunar magnetic field On the intensity of the ancient lunar magnetic field

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976lpsc....7.3373s&link_type=abstract

In: Lunar Science Conference, 7th, Houston, Tex., March 15-19, 1976, Proceedings. Volume 3. (A77-34651 15-91) New York, Pergamon

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Field Strength, Lunar Evolution, Lunar Magnetic Fields, Paleomagnetism, Dynamo Theory, Lunar Core, Remanence, Thermodynamic Properties

Scientific paper

To determine from lunar samples the intensity of the ancient lunar magnetic field requires evidence that the natural remanent magnetization (NRM) of lunar samples is of thermoremanent origin. The properties of the NRM of many lunar samples are shown to be consistent with this interpretation rather than with other well known magnetic processes although possible magnetization as a result of impacts remains to be investigated further. The few palaeointensity determinations are shown to be consistent with an exponential decay of the lunar field previously proposed. The high fields found (about 1G) eliminate the hypothesis of a permanently magnetized primaeval moon suggesting that the moon possesses an iron core which once acted as a dynamo. Simple thermodynamic arguments suggest that such high fields could be produced in a small lunar core in its early history although not at present.

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