The steady state toroidal magnetic field at the core-mantle boundary

Details The steady state toroidal magnetic field at the core-mantle boundary The steady state toroidal magnetic field at the core-mantle boundary

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..148p&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 148 (SEE N87-23341 16-91)

Physics

Geophysics

Dynamo Theory, Earth Core, Earth Mantle, Earth Rotation, Geomagnetism, Boundary Conditions, Electrical Resistivity, Steady State

Scientific paper

Recent measurements indicate that the strength of the toroidal magnetic field at Earth's core-mantle boundary is comparable in strength to the poloidal field - 5 to 10 gauss. Calculations are given to show that this is an inevitable result of the external boundary condition on the core, in which the mantle electrical conductivity is several orders of magnitude lower than that of the core. The measurements are shown to imply that the internal core magnetic field is in the range of several hundred gauss. Thus the measurements imply that the Earth's core contains a strong toroidal magnetic field. They also support the idea that Earth's dynamo, and by implication, other planetary magnetic fields, involves efficient toroidal magnetic field generation through strong differential rotation.

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