Abstract
Abstract Controlled spin and precession of liquid filled oblate spheroidal cavities in laboratory experiments that simulate luni-solar forced precession of the mantle and a simplified analytical liquid flow model, indicate Earth core flows approximated as spin about a core axis that lags behind the precessing spin axis of the mantle by a small angle (∼0·01°). Core spin is slower than mantle spin by an amount consistent with westward drift of the magnetic field (∼0·2°/yr). Theoretical and experimental evidence argue against inertia waves being effective in preventing such motion. This precessional flow model is consistent with geodynamo requirements indicating a kinematic over a magnetohydrodynamic dynamo in that viscous core-mantle coupling may dominate magnetic coupling, with only negligible topographic coupling. While the model appears to provide geodynamo requirements, it does not preclude simultaneous density gradient convective mechanisms.
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