Identification of the regime of the polar motion using coordinate data for 1900-1990

Details Identification of the regime of the polar motion using coordinate data for 1900-1990 Identification of the regime of the polar motion using coordinate data for 1900-1990

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998arep...42..558k&link_type=abstract

Astronomy Reports, Volume 42, Issue 4, July 1998, pp.558-565

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Analysis of the spectral power-density function and the Poincare 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 - annular 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. However, the appearance of a third independent frequency in the spectrum is necessary for such a transition. 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.

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