The Conductivity of Spherically Symmetric Layered Earth Models determined by Sq and longer Period Magnetic Variations

摘要: Summary An approach to the inverse problem of electromagnetic induction in spherically symmetric layered Earth models is described. In first case single periodic variations alone are considered and it assumed that conductivity uniform a thick shell which surrounds perfectly conducting sphere. The thickness determined for each variation separately by using observed value ratio internal external parts magnetic potential at surface Earth. Results have been obtained variational technique, Sq variations, 27-day its harmonics, annual variation. second several used simultaneously obtain multilayered model. Finally method give an estimate maximum screening effect oceans.