Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-26T04:53:08.225Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

Aoki, S.: 1969, Astron. J. 74, 284.Google Scholar
Aoki, S. and Kakuta, C.: 1971, Celest. Mech. 4, 171.Google Scholar
Hide, R.: 1969, Nature 222, 1055.Google Scholar
Jeffreys, H. and Vicente, R. O.: 1957, Monthly Notices Roy. Astron. Soc. 117, 142.CrossRefGoogle Scholar
Molodensky, S.: 1961, Comm. Obs. Roy. Belgique, Sér. Géophys. 58, 25.Google Scholar
Rochester, M. G. and Smylie, D. E.: 1965, Geophys. J. 10, 289.CrossRefGoogle Scholar
Rochester, M. G.: 1968, J. Geomagn. Geoelec. 20, 387.Google Scholar
Stacey, F. V.: 1970, in Mansinha, L. et al. (eds.), Earthquake Displacement Fields and the Rotation of the Earth, D. Reidel Publ. Co., Dordrecht, Holland, p. 176.Google Scholar
Takeuchi, H.: 1950, Trans. Am. Geophys. Un. 31, 651.Google Scholar