Physics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.2105b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. B2, p. 2105-2117.
Physics
8
Earth Mantle, Electromagnetic Interactions, Geomagnetism, Nutation, Toroids, Boundaries, Earth Core, Torque
Scientific paper
The electromagnetic coupling between the core and the mantle due to the presence of a toroidal field is calculated, and its effect on earth's nutation is estimated. Two coupling mechanisms are identified. One involves interactions between the toroidal and radial components of the magnetic field at the core-mantle boundary (CMB). A perturbation in the radial main field caused by the nutations produces a magnetic stress on the mantle in the presence of the toroidal main field. The second, more important coupling mechanism takes account of possible deviations in the shape of the CMB from that of an equipotential surface in a hydrostatic model earth. The toroidal field at the CMB is perturbed by a steady flow in the core over the boundary undulations. The perturbed field diffuses across the boundary and causes a Maxwell stress on the mantle when the high-frequency oscillatory flow associated with the nutation is superimposed on the steady flow.
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