Pole-strength of the earth from Magsat and magnetic determination of the core radius

Details Pole-strength of the earth from Magsat and magnetic determination of the core radius Pole-strength of the earth from Magsat and magnetic determination of the core radius

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9..258v&link_type=abstract

Geophysical Research Letters, vol. 9, Apr. 1982, p. 258-261.

Physics

36

Earth Core, Geomagnetism, Geomorphology, Magnetic Flux, Earth Mantle, Flux Quantization, Magnetic Poles, Magsat Satellites, Radii

Scientific paper

A model based on two days of Magsat data is used to numerically evaluate the unsigned magnetic flux linking the earth's surface, and a comparison of the 16.054 GWb value calculated with values from earlier geomagnetic field models reveals a smooth, monotonic, and recently-accelerating decrease in the earth's pole strength at a 50-year average rate of 8.3 MWb, or 0.052%/year. Hide's (1978) magnetic technique for determining the radius of the earth's electrically-conducting core is tested by (1) extrapolating main field models for 1960 and 1965 downward through the nearly-insulating mantle, and then separately comparing them to equivalent, extrapolated models of Magsat data. The two unsigned fluxes are found to equal the Magsat values at a radius which is within 2% of the core radius; and (2) the 1960 main field and secular variation and acceleration coefficients are used to derive models of 1930, 1940 and 1950. The same core magnetic radius value, within 2% of the seismic value, is obtained. It is concluded that the mantle is a nearly-perfect insulator, while the core is a perfect conductor, on the decade time scale.

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