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Lunar electrical conductivity, permeability and temperature from Apollo magnetometer experimentsMagnetometers were deployed at four Apollo sites on the moon to measure remanent and induced lunar magnetic fields. Measurements from this network of instruments were used to calculate the electrical conductivity, temperature, magnetic permeability, and iron abundance of the lunar interior. The measured lunar remanent fields range from 3 gammas minimum at the Apollo 15 site to 327 gammas maximum at the Apollo 16 site. Simultaneous magnetic field and solar plasma pressure measurements show that the remanent fields at the Apollo 12 and 16 sites interact with, and are compressed by, the solar wind. Remanent fields at Apollo 12 and Apollo 16 are increased 16 gammas and 32 gammas, respectively, by a solar plasma bulk pressure increase of 1.5 X 10 to the -7th power dynes/sq cm. Global lunar fields due to eddy currents, induced in the lunar interior by magnetic transients, were analyzed to calculate an electrical conductivity profile for the moon. From nightside magnetometer data in the solar wind it was found that deeper than 170 km into the moon the conductivity rises from .0003 mhos/m to .10 mhos/m at 100 km depth. Recent analysis of data obtained in the geomagnetic tail, in regions free of complicating plasma effects, yields results consistent with nightside values.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Dyal, P.
(NASA Ames Research Center Moffett Field, CA, United States)
Parkin, C. W.
(Santa Clara Univ.)
Daily, W. D.
(Brigham Young Univ.)
Date Acquired
August 9, 2013
Publication Date
January 1, 1977
Publication Information
Publication: The Soviet-Am. Conf. on Cosmochem. of the Moon and Planets, pt. 1
Subject Category
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.
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