Geoelectric interpretation of results of global magnetic-variation sounding

Details Geoelectric interpretation of results of global magnetic-variation sounding Geoelectric interpretation of results of global magnetic-variation sounding

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ge%26ae..18..755d&link_type=abstract

Geomagnetizm i Aeronomiia, vol. 18, July-Aug. 1978, p. 755-758. In Russian.

Computer Science

Sound

Electrical Resistivity, Geoelectricity, Geomagnetism, Magnetic Variations, Mathematical Models, Sounding, Activation Energy, Distribution Functions, Gradients, Harmonic Analysis, Magnetic Measurement, Spherical Harmonics

Scientific paper

A geoelectric interpretation of geomagnetic-field variations is given based on available experimental data concerning apparent resistivity. The apparent-resistivity data are interpreted in the framework of a gradient model that assumes a continuous variation of electrical conductivity with depth from 400 to 500 km. An apparent-resistivity curve characterized by optimum parameters is obtained and compared with a curve derived from limited experimental data. Both curves are found to contain a distinct primary discontinuity in the geoelectric depth profile at depths of about 550 km, with conductivity sharply increasing at these depths. A gradient-type conductivity model is developed which indicates that the maximum variation in conductivity occurs at depths of 500 to 1000 km and that conductivity increases more smoothly with depth at greater depths. It is concluded that the gradient model is a better representation of the apparent-resistivity data than the discontinuous model.

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