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Global electromagnetic induction in the moon and planetsExperiments and analyses concerning electromagnetic induction in the moon and other extraterrestrial bodies are summarized. The theory of classical electromagnetic induction in a sphere is first considered, and this treatment is extended to the case of the moon, where poloidal eddy-current response has been found experimentally to dominate other induction modes. Analysis of lunar poloidal induction yields lunar internal electrical conductivity and temperature profiles. Two poloidal-induction analytical techniques are discussed: a transient-response method applied to time-series magnetometer data, and a harmonic-analysis method applied to data numerically Fourier-transformed to the frequency domain, with emphasis on the former technique. Attention is given to complicating effects of the solar wind interaction with both induced poloidal fields and remanent steady fields. The static magnetization field induction mode is described, from which are calculated bulk magnetic permeability profiles. Magnetic field measurements obtained from the moon and from fly-bys of Venus and Mars are studied to determine the feasibility of extending theoretical and experimental induction techniques to other bodies in the solar system.
Document ID
19740028957
Document Type
Reprint (Version printed in journal)
Authors
Dyal, P. (NASA Ames Research Center Space Sciences Div., Moffett Field, Calif., United States)
Parkin, C. W. (Santa Clara, University Santa Clara, Calif., United States)
Date Acquired
August 7, 2013
Publication Date
September 1, 1973
Subject Category
SPACE SCIENCES
Distribution Limits
Public
Copyright
Other