Analytical solutions to global and local problems of electromagnetic induction in the earth

摘要: Abstract This review of analytic solutions is divided into two parts. The first part reviews electromagnetic induction in radially symmetric distributions conductivity, and appropriate to the study global problems. In second part, local problems a specific nature are considered, model being half-space conductor with at least one lateral discontinuity separating regions different uniform conductivities. some problems, an approximate surface-boundary condition used, it shown that accuracy has yet be determined satisfactorily.