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On the Electro-Magnetic Coupling Between the Core and the Mantle of the Earth

Published online by Cambridge University Press:  14 August 2015

N. Sekiguchi
N. Sekiguchi*
Affiliation:
Tokyo Astronomical Observatory, Mitaka, Tokyo 181, Japan

Extract

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Recently theories of the Earth's rotation based on models with an elastic mantle and fluid core have achieved considerable success. It was assumed in these models that the dissipative (electro-magnetic and viscous) couplings between the fluid core and the mantle have negligible effects. The discrepancies between the theories and the observations were much reduced. It seems, however, that these theories are not sufficiently successful in explaining the observed phenomena concerning the Chandler wobble. For example, we had a very small polar radius in the decade around 1930, and the phase of the polar wobble was much advanced in this decade compared with the mean period of revolution. The apparent period of the polar wobble maintained an almost constant value of 1.16 yr during 1930-1942 (Sugawa 1969; Guinot 1972; Stoyko 1972). The present author (Sekiguchi 1975) found from the latitude observations between 1830 and 1860 that the amplitude was also diminished and the period had an almost constant value of 1.16 yr. The common behaviour of the polar wobble in both periods is difficult to explain as an accidental happening.

Type
Session IV
Information
Symposium - International Astronomical Union , Volume 78: Nutation and the Earth's Rotation , 1980 , pp. 205 - 208
Copyright
Copyright © Reidel 1980 

References

Gans, R.F.: 1972, J. Geophys. Res. 77, 360.CrossRefGoogle Scholar
Guinot, B.: 1972, Astron. Astrophys. 19, 207.Google Scholar
Hide, R.: 1969, Nature 222, 1055.Google Scholar
MacDonald, G.J.F. and Ness, N.F.: 1961, J. Geophys. Res. 66, 1865.Google Scholar
Rochester, M.G. and Smylie, D.E.: 1965, Geophys. J. Roy. Astron. Soc. 10, 289.CrossRefGoogle Scholar
Sekiguchi, N.: 1975, J. Geodetic Soc. Japan 21, 131.Google Scholar
Sekiguchi, N.: 1976, Publ. Astron. Soc. Japan 28, 277.Google Scholar
Stoyko, A.: 1972, Vistas in Astron. 13, 51.CrossRefGoogle Scholar
Sugawa, C.: 1969, Publ. Intern. Latitude Obs. Mizusawa 7, 27.Google Scholar
Yatskiv, Ya. S., Korsun’, A.A. and Rykhlova, L.V.: 1972, Astron. Zhurnal 49, 1311.Google Scholar