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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:  12 April 2016

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

Abstract

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Criticisms of the senior author’s paper (1967) are examined, and it is found that there still seems to be a possibility that the cause of the excess secular change is in the mantle-core coupling. Part II is devoted to an improvement of the previous result (Aoki, 1969) using a model of the elastic mantle and fluid core. In order to give the observed value of excess secular change of the obliquity, a value of the coupling coefficient of the Earth’s rotation is 3.5 times larger than Rochester’s (1968) value is required. This is not impossible from the geophysical view-point. In fact, if we take into account Hide’s argument (1969), then the coupling coefficient will be much larger than the present geophysical value.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 9: The IAU System of Astronomical Constants , October 1971 , pp. 171 - 181
Copyright
Copyright © Reidel 1971

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