Physics – Space Physics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982rvgsp..20..411s&link_type=abstract
Reviews of Geophysics and Space Physics, vol. 20, Aug. 1982, p. 411-455. NASA-supported research.
Physics
Space Physics
21
Electrical Resistivity, Magnetic Induction, Magnetohydrodynamics, Moon, Selenology, Solar Wind, Electrodynamics, Electromagnetic Scattering, Lunar Core, Lunar Temperature, Multipoles, Transient Response
Scientific paper
The moon constitutes a nonhydromagnetic, but electrically conducting, target for the solar wind whose response reaches a peak as frequency increases and diminishes with further increase in frequency, suggesting the presence of the magnetic quadrupole moment. Magnetometer measurements of induction using Explorer and Apollo instruments are studied from both the harmonic and transient standpoint, and the resulting determination of internal bulk electrical conductivity is discussed. The closeness of the estimated internal temperature to the Ringwood-Essene solidus at 150-250 km depths suggests a layer of enhanced conductivity in lieu of high temperature. A reduced core radius estimate with a one-sigma upper limit of 360 km is reported. The discussion of lunar electrodynamics presented is restricted to the problem of induction, with only passing reference to flow fields and regional electric fields.
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