Motions of the Earth's pole as a dynamical three-frequency system

Details Motions of the Earth's pole as a dynamical three-frequency system Motions of the Earth's pole as a dynamical three-frequency system

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999arep...43..556s&link_type=abstract

Astronomy Reports, Volume 43, Issue 8, August 1999, pp.556-560

Astronomy and Astrophysics

Astronomy

Scientific paper

The oscillations of the Earth's pole are considered as a dynamical system in which the clearly pronounced Chandler period is incommensurate with the externally excited annual period. Beats at combined frequencies should be observed in such systems. The motion of the pole observed over the last century reveal even more complicated behavior. Modeling this behavior requires at least a three-frequency system, with an additional oscillation period (internal or external) that is incommensurate with the two periods mentioned above. The desired system is obtained by mapping the first return of the phase trajectory to a Poincare section, determined from the approximate times of coincidence between the amplitude maxima of the annual and Chandler oscillations of the pole.

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