Physics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pepi...20..111b&link_type=abstract
(Topical Conference on Origins of Planetary Magnetism, Houston, Tex., Nov. 8-11, 1978.) Physics of the Earth and Planetary Inter
Physics
8
Dynamo Theory, Earth Core, Earth Mantle, Electromagnetic Fields, Geoelectricity, Geomagnetism, Electrical Resistivity, Magnetohydrodynamics, Mathematical Models, Telluric Currents, Terrestrial Planets
Scientific paper
The paper examines investigation of planetary interiors from measurements of the global planetary magnetic field at its surface. An idealized but typical rotating spherically symmetric planet containing a highly conducting uniform fluid core surrounded by a nearly insulating rigid mantle is considered; the mantle conductivity falls monotonically from the base of the planetary mantle to zero at the surface. Observations of the instantaneous internal vector magnetic field and the time separation between measurement epochs are discussed. Finally, methods of obtaining information on the following properties are described: (1) depth of the core-mantle boundary, (2) depth to the current and motion sources responsible for the planetary dynamo, and (3) large-scale horizontal fluid motion at the top of the core.
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