Electromagnetic Core-mantle Coupling |
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| Abstract: | i
The work of Bullard (1950) and Rochester (1960) on the geomagnetic westward drift and its effects on the Earth's rotation is extended to investigate the effects of assuming various distributions of electrical conductivity in the mantle. By a proper choice of conductivities, one is able to increase the theoretical value for the tightness of the coupling by a factor of at least six over that afforded by Rochester's model, without sacrificing agreement with observations on the rapidity with which changes in the secular variation are established at the Earth's surface. It is shown that it is reasonable to attribute the observed random changes in the length of the day to perturbations in the electromagnetic coupling. |
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