Motions at core surface in the geostrophic approximation

Details Motions at core surface in the geostrophic approximation Motions at core surface in the geostrophic approximation

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...39..270l&link_type=abstract

(American Geophysical Union, Session on Irregularities in the Secular Variation and Geodynamic Implications, Cincinnati, OH, May

Physics

82

Approximation, Earth Core, Geodynamics, Geomagnetism, Geostrophic Wind, Secular Variations, Constraints, Flow Equations, Magnetic Field Configurations, Stochastic Processes

Scientific paper

Motions at the top of the core which generate the observed Secular Variation (SV) field are computed. To reduce the well known ambiguity of the solution, two constraints are added: the flow is a large scale one and is geostrophic. The computed flow then has a very simple geometry; its poloidal part is roughly axisymmetrical with respect to an equatorial diameter. This geometry is almost unchanged from 1970 to 1980 while the intensity of the velocity is nearly doubled.

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