Precession of the Lunar Core

Details Precession of the Lunar Core Precession of the Lunar Core

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.2109m&link_type=abstract

American Astronomical Society, DPS meeting #42, #21.09; Bulletin of the American Astronomical Society, Vol. 42, p.987

Astronomy and Astrophysics

Astronomy

Scientific paper

Goldreich (1967) showed that a lunar core of low viscosity would not precess with the mantle. We show that this is also the case for much of lunar history. But when the Moon was close to the Earth the Moon's core was forced to follow closely the precessing mantle, in that the rotation axis of the core remained nearly aligned with the symmetry axis of the mantle. The transition from locked to unlocked core precession occurred between 26.0 and 29.0 Earth radii. Implications for an early lunar dynamo will be discussed.

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