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Reduction of the Past ILS Data in a Uniform System

Published online by Cambridge University Press:  14 August 2015

S. Yumi
S. Yumi*
Affiliation:
International Latitude Observatory of Mizusawa Mizusawa, Iwate, 023 Japan

Extract

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Analyses of the nutation terms based on the results of astronomical observations of time and latitude provide valuable information to promote studies on the constitution of the Earth's interior. Indeed, the results of analyses of the nutations agree well with those predicted by theory for a fluid core. This shows that the matter of the outer core, 3,000 km and more below the Earth's surface, is not only in a fused state but also is a “fluid” which can move in response to the external forces. Many additional studies on the nutation terms are now in progress, for example, to estimate an extreme value of viscosity of the fluid core, to discuss the possibility of the geomagnetic dynamo being driven by the precession, and so on.

Type
Session I
Information
Symposium - International Astronomical Union , Volume 78: Nutation and the Earth's Rotation , 1980 , pp. 13 - 16
Copyright
Copyright © Reidel 1980 

References

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