Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cemda..87...39z&link_type=abstract
Celestial Mechanics and Dynamical Astronomy, v. 87, Issue 1, p. 39-51 (2003).
Astronomy and Astrophysics
Astronomy
2
Scientific paper
The tidal force in the Earth-Moon system exerted on the Earth's equatorial bulge results in the Earth's precession. It was proposed a long time ago that the strong shear flow driven by the precession of the Earth may power the Earth's dynamo in its liquid core. We present a nonlinear analytical study investigating how the Poincaré force in a rotating, precessing spherical system drives a large-amplitude differential rotation which plays a major role in the modern theory of the geodynamo. The analysis is based on a perturbation approach in terms of the small Poincaré force parameter. It is found that the amplitude of the precession-driven differential rotation is consistent with that estimated from the geomagnetic secular variation.
Li Ligang
Liao Xin-hao
Zhang Keke
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