The westward drift of the geomagnetic field caused by length-of-day variation, and the topography of the core-mantle boundary.

Details The westward drift of the geomagnetic field caused by length-of-day variation, and the topography of the core-mantle boundary. The westward drift of the geomagnetic field caused by length-of-day variation, and the topography of the core-mantle boundary.

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993geoji.114..696y&link_type=abstract

Geophysical Journal International, Vol. 114, No. 3, p. 696 - 710

Physics

2

Scientific paper

The authors propose that the westward drift of the geomagnetic field is caused by length-of-day (l.o.d.) variation through topographic coupling between the mantle and the core. Fluctuations of the rotation velocity of the mantle induce radial flow in the core through topographic coupling at the core-mantle boundary (CMB). The induced flow bends the toroidal field to generate a poloidal field which appears to drift westwards. An analytical model is constructed to describe this situation on the basis of a quasi-geostrophic approximation. The authors compare their model with observations of the geomagnetic field over the last several hundred years.

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