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Study of the Regime of the Polar Motion by Means of Numerical Method

Published online by Cambridge University Press:  12 April 2016

L. Rykhlova  and
G. Kurbasova
L. Rykhlova
Affiliation:
Institute for Astronomy, Russian Academy of Sciences, 109017 Pyatnitskaya Str. 48, Moscow, Russia. e-mail:[email protected]
G. Kurbasova
Affiliation:
Crimea Astrophysical Observatory, Ukrainian Academy of Sciences, p/o Nauchnyi, Crimea, 334413, Ukraine. e-mail:[email protected]

Abstract

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Analysis of the spectral power-density function and the Poincaré method are used to identify the type of motion exhibited by the Earth’s pole from 1900–1990. The former method allows identification of a quasi-periodic regime with two main frequencies — annual and Chandler. The existence of combinational frequencies in this spectrum and the broadening of the spectral peaks suggest a quasi-periodic regime making a transition to chaos. It is concluded that the identification of the polar motion regime over the time interval considered is insufficient to predict the further evolution of the system over arbitrarily long times.

Type
Part 5. Chandler and Annual Polar Motion: Observations and Excitation
Information
International Astronomical Union Colloquium , Volume 178: Polar Motion: Historical and Scientific Problems , 2000 , pp. 487 - 491
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

Vondrák, J., Ron, C., Pešek, I., and Čepek, A., 1995, Astron. Astrophys., 297, p. 899.Google Scholar