The Earth's Electrical Environment (1986) / Chapter Skim
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Pages 232-233
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The fundamental causes of telluric currents are now believed to be understood. They are produced either through electromagnetic induction by the time-varying, external-origin geomagnetic field or whenever a conducting body (such as seawater)
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From page 233... ...
is in the horizontal plane or the currents are not the result of the induced emf." The mathematical modeling of telluric currents, unlike the understanding of their physical causes, is still far from a satisfactory solution. As far as Earth currents are concerned, the investigations have been for the most part carried out on a local or limited regional scale.
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