Steady state toroidal magnetic field at earth's core-mantle boundary

Details Steady state toroidal magnetic field at earth's core-mantle boundary Steady state toroidal magnetic field at earth's core-mantle boundary

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.3935l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, March 10, 1991, p. 3935-3942.

Physics

10

Dynamo Theory, Earth Core, Earth Mantle, Geomagnetism, Magnetic Field Configurations, Planetary Magnetic Fields

Scientific paper

Measurements of the dc electrical potential near the top of earth's mantle have been extrapolated into the deep mantle in order to estimate the strength of the toroidal magnetic field component at the core-mantle interface. Recent measurements have been interpreted as indicating that at the core-mantle interface, the magnetic toroidal and poloidal field components are approximately equal in magnitude. A motivation for such measurements is to obtain an estimate of the strength of the toroidal magnetic field in the core, a quantity important to our understanding of the geomagnetic field's dynamo generation. Through the use of several simple and idealized calculation, this paper discusses the theoretical relationship between the amplitude of the toroidal magnetic field at the core-mantle boundary and the actual amplitude within the core. Even with a very low inferred value of the toroidal field amplitude at the core-mantle boundary, (a few gauss), the toroidal field amplitude within the core could be consistent with a magnetohydrodynamic dynamo dominated by nonuniform rotation and having a strong toroidal magnetic field.

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