The expulsion of magnetic flux from the Earth's core.

Details The expulsion of magnetic flux from the Earth's core. The expulsion of magnetic flux from the Earth's core.

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986geoji..87..669b&link_type=abstract

Geophysical Journal International, Vol. 87, No. 2, p. 669 - 678

Physics

Geomagnetic Field:Origin

Scientific paper

A simple 2-D model of the effect of an upwelling motion on the toroidal field in the Earth's core is investigated. It is found that flux is readily expelled from the core, indicating that the frozen-flux approximation can fail, even when the magnetic Reynolds number in the core is high. This process provides a simple explanation of features in the magnetic field which have recently been identified at the core-mantle boundary beneath southern Africa.

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