Abstract
The ratios of the internal to external source terms of the earth's surface potential for certain geomagnetic fluctuations are indicative of the electrical conductivity of the earth's interior. A nonlinear first-order differential equation is derived for these ratios as functions of depth and conductivity in a spherically symmetric earth. This equation may be solved numerically to match an observable surface ratio with a conductivity-depth profile, or it may be solved analytically for a few of the infinite number of possible profiles. This approach provides a good qualitative insight into the problem of geomagnetic induction in a concentrically stratified earth.
Published Version
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