Abstract
The electromagnetic coupling between the Earth's core and the mantle is studied when the geomagnetic dipole field varies periodically. The oscillation of the geomagnetic dipole moment with a period of 8000 years, its amplitude being 50% of the present moment, is capable of causing a fluctuation of 10−11 rad/s in the angular velocity of the mantle. The angular velocity increases with a decrease in the dipole moment.
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