Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990an....311..317g&link_type=abstract
Astronomische Nachrichten (ISSN 0004-6337), vol. 311, no. 5, 1990, p. 317-325.
Astronomy and Astrophysics
Astronomy
1
Dynamo Theory, Earth Core, Magnetic Anomalies, Secular Variations, Earth Mantle, Magnetic Field Configurations, Physical Properties
Scientific paper
Nonaxisymmetric motions of the outer core of the earth are important for the dynamo problem and the excitation of the decade variations of the polar motion. The components of the vector of a rigid rotation of the outer core about an inclined axis were estimated by a first-order approximation of the frozen-field theory of the geomagnetic secular variation from 1903.5 to 1975.5. The trends and quasi-periodic constituents of these quantities were computed. It was shown that the position and time behavior of the rotational pole of the outer core differ considerably from the well known coordinates of the dipole axis. Some periods of the equatorial components of the rotational vector are comparable with those of the axial component previously derived for a pure axial rotation.
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