ON THE RADIAL GEOELECTRICAL STRUCTURE OF THE MID-MANTLE FROM MAGNETOVARIATIONAL SOUNDING USING MAGSAT DATA

Deep magnetovariational soundings have been carried out using the data of the geomagnetic observatory net and the MAGSAT satellite. Complex apparent resistivities estimated from satellite data by two independen t methods are found to be in accordance with numerous mean values obta ined only from ground data. Assuming the spherical symmetry of the Ear th's layers the interpretation in the parametric models class of joint results has been done. The global estimation of the electrical conduc tivity structure of the Earth's mantle indicates the presence of a hig h conductivity layer about 200 km thick at a depth of approximately 60 0-700 km.