On the effects of a bumpy core-mantle interface

Details On the effects of a bumpy core-mantle interface On the effects of a bumpy core-mantle interface

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pepi...19..239e&link_type=abstract

Physics of the Earth and Planetary Interiors, vol. 19, July 1979, p. 239-254.

Physics

2

Earth Core, Earth Mantle, Geomagnetism, Gravitational Fields, Solid-Solid Interfaces, Magnetic Field Configurations, Topography

Scientific paper

The model discussed by Moffatt and Dillon (1976) is extended to include a horizontal component of angular velocity and a uniform small poloidal field. In addition, the uniform toroidal is replaced by one which vanishes everywhere in the mantle and increases linearly, from zero on the interface, with the vertical coordinate. It is shown that the presence of the angular velocity and the small poloidal field together with the present choice of toroidal magnetic field, has a significant effect both on the correlation between the variable parts of the magnetic and gravitational fields of the earth, and on how far the disturbances caused by the topography of the interface can penetrate into the liquid core. In particular it is found that the highest value of the correlation function is +0.79 which corresponds to a situation in which the magnetic potential is displaced both latitudinally and longitudinally relative to the gravitational potential.

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