The general theory of geoelectromagnetic sounding systems accounting the electrodynamics of spherical sources

Abstract

The incompleteness and limitation of physical treatment of formation of the electromagnetic response inherent to the classical mt- theory, is almost obvious and is fixed even terminologically if we take into account the spherical of sources of mt- fields. As is known, the electrodynamics of the spherical sources differs from the usual electrodynamics, because, alongside with an induction there are two such excitation as ? dynamo, when the magnetic field is created by magnetic field, and by the generation of toroidal fields by spherical components of a current. The result of the general concept, theoretical bases (including the global and local approaches), functional ratio between spherical and flat models, methodical orientation of field experiment and data processing, modeling and inversion ? requires reconsideration. Most significant theoretical result related with the affinor of input impedance and scalar conditions of impedance type or an arbitrary closed discontinuity are analyzed. A general theory of impedance measurements in the methods of geoelectromagnetism is presented. It is important that in that case the experiment is fully and uniformly conducted in terms of scalar input impedance and their horizontal gradient independently from the concept of impedance tensor, telluric and magnetic transient functions and vectors induction based largely on empiric or heuristic concepts. The idea of unification of methods of magnetotelluric sounding (MTS), horizontal spatial gradient analysis (HSG) and deeps geomagnetic sounding (GDS) is realized. The approach envisages an alternative strategy for practical implementation.