Simple models of fluid flow at the core surface derived from geomagnetic field models

Details Simple models of fluid flow at the core surface derived from geomagnetic field models Simple models of fluid flow at the core surface derived from geomagnetic field models

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989geoji..99..173b&link_type=abstract

Geophysical Journal International (ISSN 0955-419X), vol. 99, Oct. 1989, p. 173-182.

Physics

57

Earth Core, Geomagnetism, Geophysical Fluids, Magnetic Variations, Fluid Flow, Secular Variations

Scientific paper

The fluid flow at the core surface is determined for a given model of temporal magnetic field variation, assuming steady flow and adopting the frozen-flux approximation. Evidence is presented for ageostrophic flow in the form of flow across the geographical equator. A simple pattern of the large-scale toroidal part of the flow is found. The pattern is nearly symmetric about the equator. Changes in the flow pattern are obtained from flow maps covering 5-year intervals beginning in 1915.

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