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The Excess Secular Change in the Obliquity of the Ecliptic and Its Relation to the Internal Motion of the Earth

Published online by Cambridge University Press:  27 June 2016

Chuichi Kakuta  and
Shinko Aoki
Chuichi Kakuta
Affiliation:
International Latitude Observatory, Mizusawa, Iwate
Shinko Aoki
Affiliation:
Tokyo Astronomical Observatory, Mitaka, Tokyo

Abstract

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The previous result (Aoki, 1969) on the explanation of the excess secular change in the obliquity of the ecliptic frictional couplings in the rigid constituents, the mantle and the core, is extended by using a model of an elastic and electrically conducting mantle and a hydromagnetic core. The secular change of the obliquity of the ecliptic referred to the mantle is found to be 1/3.2 times of the observed value, if the electrical conductivities of the fluid core and the mantle are assumed to be 3·10−6 emu and 3·10−9 emu respectively. A large secular deceleration of the Earth's rotational speed obtained in the previous result is proved to be strongly reduced because of weak excitation of the perturbing potential for a long time variation.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 48: Rotation of the Earth , 1972 , pp. 192 - 195
Copyright
Copyright © Reidel 1972 

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