VARIATION OF THE PARAMETERS OF THE CHANDLER AND ANNUAL COMPONENTS ACCORDING TO THE MOVEMENT OF THE NORTH POLE SINCE 1962

Abstract

The paper analyzes the variation in the amplitude and periods of the Chandler and annual components according to the International Earth Rotation and Reference Systems (IERS) bulletin EOP14C04, which contains data on the deviation of the North Pole from 1962 to the present with the sampling time of one day. A specially created digital symmetrical non-recursive filter was used to isolate the main harmonics of the pole motion. It is shown that these components manifest themselves as two connected oscillating systems that are in permanent exchange of mechanical energy, and the change in the energy of these oscillations has a mirror-symmetrical appearance. This exchange occurs from a state of complete dominance of the Chandler component to its almost complete attenuation. The latter circumstance allows us to estimate the relative masses of these oscillating systems, which shows the exceptional role of the Earth’s core in the formation of the Chandler component of the pole’s movement.