What is it about?

The article presents the first numerical calculation of the currents induced by magnetic field variations in a spherical model of the earth with a realistic distribution of subsurface conductance in the world oceans and continents. The subsurface layer is considered as a thin sheet. The leakage of the induced currents from the oceans into the earth mantle is ignored in this first computation. The numerical evaluation is the first example of the application of the iterative dissipative method (IDM).

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The numerical evaluation is the first example of the application of the iterative dissipative method (IDM) suggested by the authors in "Electromagnetic induction in a non-uniform spherical model of the Earth" published in Ann. Geophys. , t. 36,fasc. 2, 1980, p. 127-134. The approach was later developed to models with leakage currents, planar, and cylindrical models, models with displacement currents and anisotropy. It became a starting point for a significantly more robust and efficient modified IDM (MIDM) proposed by B. Sh. Singer in 1988 and published in "Method for solution of Maxwell's equations in non-uniform media" Geophysical Journal Int., 1995, 120, pp. 590-598.

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This page is a summary of: Electromagnetic induction in a spherical model of the earth with a real distribution of near-surface conductivity, Physics of The Earth and Planetary Interiors, April 1981, Elsevier,
DOI: 10.1016/0031-9201(81)90128-x.
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