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Induced and Permanent Magnetism on the Moon: Structural and Evolutionary Implications

Published online by Cambridge University Press:  30 March 2016

C. P. Sonett ,
P. Dyal ,
D. S. Colburn ,
B. F. Smith ,
G. Schubert ,
K. Schwartz ,
J. D. Mihalov  and
C. W. Parkin
C. P. Sonett
Affiliation:
Ames Research Center, NASA, Moffett Field, Calif., U.S.A.
P. Dyal
Affiliation:
Ames Research Center, NASA, Moffett Field, Calif., U.S.A.
D. S. Colburn
Affiliation:
Ames Research Center, NASA, Moffett Field, Calif., U.S.A.
B. F. Smith
Affiliation:
Space Sciences Department, University of California at Los Angeles, Calif., U.S.A.
G. Schubert
Affiliation:
Space Sciences Department, University of California at Los Angeles, Calif., U.S.A.
K. Schwartz
Affiliation:
American Nucleonics Corporation, Woodland Hills, Calif., U.S.A.
J. D. Mihalov
Affiliation:
Ames Research Center, NASA, Moffett Field, Calif, U.S.A.
C. W. Parkin
Affiliation:
Ames Research Center, NASA, Moffett Field, Calif, U.S.A.

Abstract

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It is shown that the Moon possesses an extraordinary response to induction from the solar wind due to a combination of a high interior electrical conductivity together with a relatively resistive crustal layer into which the solar wind dynamic pressure forces back the induced field. The dark side response, devoid of solar wind pressure, is approximately that expected for the vacuum case. These data permit an assessment of the interior conductivity and an estimate of the thermal gradient in the crustal region. The discovery of a large permanent magnetic field at the Apollo 12 site corresponds approximately to the paleomagnetic residues discovered in both Apollo 11 and 12 rock samples The implications regarding an early lunar magnetic field are discussed and it is shown that among the various conjectures regarding the early field the most prominent are either an interior dynamo or an early approach to the Earth though no extant model is free of difficulties.

Type
II. Special Meeting on Direct Exploration of the Moon
Information
Highlights of Astronomy , Volume 2: Highlights of Astronomy. As presented at the XIVth General Assembly of the IAU, 1970 , 1971 , pp. 173 - 188
Copyright
Copyright © Reidel 1971

References

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