Two-scale model of a geomagnetic field variation

Details Two-scale model of a geomagnetic field variation Two-scale model of a geomagnetic field variation

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993geoji.112..147b&link_type=abstract

Geophysical Journal International (ISSN 0956-540X), vol. 112, no. 1, p. 147-158.

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18

Earth Core, Earth Mantle, Geomagnetism, Two Dimensional Models, Magnetic Flux, Secular Variations

Scientific paper

The effect of the vertical scale is investigated by considering a simple kinematic two-scale model of fluid flow inducing a variable magnetic field. Depending on the time constant, the induced magnetic field displays a variety of behaviors and geometries. In the high-frequency case, for example, a strong magnetic field tangential to the core mantle boundary, and hidden in the Delta layer, can be generated. A detailed computation and description of this magnetic field are presented. Some possible features of the secular variation of the actual geomagnetic field are discussed in the light of the model proposed here.

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