Abstract:
A model of oscillations of Earth's poles is constructed on the basis of the
analysis of the gravitational torques from Sun and Moon. The model reflects
physical processes and does not imply using curve fitting techniques, based,
for example, on the polynomial approximation. Within the framework of this
model, the Chandler frequency is interpreted as the fundamental frequency of
oscillations of the mechanical system and the annual frequency as the frequency
of the excitation force. A fine mechanism of excitation of the oscillations
based on the combination of natural and forced frequencies is revealed. The
model has only six parameters that can be identified by applying the least
squares technique to the experimental data of the International Earth Rotation
and Reference Systems Service. The prediction provided by the proposed model
has high degree of accuracy for an interval of several years.
Keywords:Earth's pole oscillations, gravitational torques.
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