On the frozen flux velocity field at the surface of earth's core necessary to account for the poloidal main magnetic field and its secular variation |
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| Authors: | Lorant A Muth Edward R Benton |
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| Institution: | 1. Department of Physics, University of Colorado, Boulder, CO 80309 U.S.A.;2. Department of Astro-Geophysics, University of Colorado, Boulder, CO 80309 U.S.A. |
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| Abstract: | An expression for the inviscid horizontal velocity field at the surface of the Earth's core necessary to account for the poloidal main magnetic field and its secular variation seen at the Earth's surface is derived for an insulating mantle in the limit of infinite core conductivity. The starting point of derivation is Ohm's law rather than the magnetohydrodynamic induction equation. Maps of the resulting motion for epoch 1965.0 at different truncation levels are presented and discussed. |
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