Nonuniform rotation of the Earth and geomagnetic drift

The transmission of mechanical forces of the magnetic field through the top layers of the core and into the mantle is analyzed. It is shown that moderate fluctuations of the toroidal field near the boundary of the core are adequate to produce the observed variations in the Earth's rate of rotation. A simple model of the boundary layer of the core is worked out and it shown that the angular velocity, on going down from the boundary of the core, must first decrease and then increase again, in agreement with the observations on the westward drift and with the dynamo theory.