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
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.
- Publication:
-
Physics of the Earth and Planetary Interiors
- Pub Date:
- March 1981
- DOI:
- 10.1016/0031-9201(81)90111-4
- Bibcode:
- 1981PEPI...24..245M
- Keywords:
-
- Earth Core;
- Earth Motion;
- Geomagnetism;
- Magnetohydrodynamic Flow;
- Secular Variations;
- Dynamo Theory;
- Earth Mantle;
- Maps;
- Poloidal Flux;
- Three Dimensional Motion;
- Velocity Distribution;
- Geophysics