Theoretical estimates of the westward drift

Details Theoretical estimates of the westward drift Theoretical estimates of the westward drift

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pepi...36...43i&link_type=abstract

(International Association of Geomagnetism and Aeronomy, Symposium on Origin of Main Fields and Secular Changes of the Earth and

Physics

1

Drift Rate, Dynamo Theory, Earth Core, Earth Mantle, Rotating Fluids, Geoelectricity, Integral Equations, Lorentz Force, Torque

Scientific paper

A theoretical estimate is given of th westward drift of the nondipole features of the earth's magnetic field, on the basis of a dynamo model. The drift rate at the core-mantle interface along the equator is derived from the product of three factors: a geometrical factor which is dependent on the structural character of the field; the ratio of rms toroidal to poloidal fields; and the ratio of core magnetic diffusivity to core radius (10 to the -4the cm/s). It is shown that the result is essentially independent of the values for mantle diffusivity and effective mantle depth, and may be either positive or negative. The estimated drift rate for an rms toroidal field of the order of 15 Gs is found to be comparable to observational results.

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