Secular variation of the obliquity of the ecliptic from a core-mantle coupling

Details Secular variation of the obliquity of the ecliptic from a core-mantle coupling Secular variation of the obliquity of the ecliptic from a core-mantle coupling

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983acasn..24..177g&link_type=abstract

(Acta Astronomica Sinica, vol. 24, no. 1-3, 1983, p. 177-181) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 7, Dec.

Physics

Geophysics

Earth Core, Earth Mantle, Earth Rotation, Ecliptic, Geophysics, Secular Variations, Angular Velocity, Friction, Matrices (Mathematics)

Scientific paper

For an earth consisting of a rigid core and a rigid mantle coupled by nonistropic friction, it is shown that if the core rotates slightly faster than the mantle, then the observed change of the obliquity of the ecliptic can be accounted for without giving rise to an unacceptably high rate of spin-down of the earth. Although sufficient evidence is now lacking to conclude that the mantle and core rotate differentially, the sign and order of magnitude of the difference are right for explaining the earth's rate of spin.

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