Physics – Fluid Dynamics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gapfd..21..303s&link_type=abstract
Geophysical and Astrophysical Fluid Dynamics, vol. 21, Issue 3, pp.303-313
Physics
Fluid Dynamics
8
Scientific paper
The induced magnetic field in the Earth's mantle is computed for an electrical conductivity of the mantle of form = a(a/r) where a is the core radius. When the inducing core motion is a uniform westward drift of -10-10s-1 relative to the mantle, the retarding couple reaches -1019 Nm. This result can be obtained with values and α such that the time scale of screening, μσa2/α2, is still below 10 years. The retarding couple, and in particular the contribution from the higher field harmonics, increases with increasing concentration of the conducting layer towards the core-mantle boundary. Deviations from the average torque balance of order 10% of the retarding couple can account for the "decade fluctuations" in the Earth's rate of rotation.
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