The periodic variations of the core drift rate - Global and zonal motions

Details The periodic variations of the core drift rate - Global and zonal motions The periodic variations of the core drift rate - Global and zonal motions

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990an....311...75g&link_type=abstract

Astronomische Nachrichten (ISSN 0004-6337), vol. 311, no. 1, 1990, p. 75-84.

Astronomy and Astrophysics

Astronomy

1

Drift Rate, Earth Core, Earth Mantle, Earth Rotation, Periodic Variations, Angular Momentum, Geodynamics, Secular Variations, Time Dependence

Scientific paper

Toroidal zonal motions at the top of the earth's core were computed from the observed secular variation and investigated with regard to their time dependence. Previously derived results for a pure westward drifting core could be re-examined. Additionally, the well-known 66.7 year period was found to be an oscillation of the zonal velocity field of third degree. With respect to periodic constituents, the total magnetic core-mantle coupling torque according to the zonal motions is comparable with that derived for a pure westward drifting core. Some differences in period lengths and amplitudes do not remove previously stated differences between the spectra of the magnetic and mechanical torques on principle.

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