Long-period nutational-precessional motions of the instantaneous Earth rotation pole

V.Yu. Belashov ^a∗ , E.S. Belashova ^b∗∗ , O.A. Kharshiladze ^c∗∗∗

^a Kazan Federal University, Kazan, 420008 Russia

^b Kazan National Research Technical University named after A.N. Tupolev, Kazan, 420111 Russia

^c Ivane Javakhishvili Tbilisi State University, Tbilisi, 0179 Georgia

E-mail: ^∗vybelashov@yahoo.com, ^∗∗bel_lena@mail.ru, ^∗∗∗o.kharshiladze@mail.ru

Received November 11, 2019

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DOI: 10.26907/2541-7746.2020.4.467-480

For citation: Belashov V.Yu., Belashova E.S., Kharshiladze O.A. Long-period nutational-precessional motions of the instantaneous Earth rotation pole. Uchenye Zapiski Kazanskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki, 2020, vol. 162, no. 4, pp. 467–480. doi: 10.26907/2541-7746.2020.4.467-480. (In Russian)

Abstract

The influence of the rotational regime on real long-period nutational-precessional motions of the instantaneous pole of the Earth’s rotation is considered. The solar magnetospheric (through changes in the angular velocity of rotation) mechanism of action is discussed. The ob- served 12-month oscillations of the instantaneous axis of rotation are explained by the influence of the deforming force arising when the angular velocity changes, which causes deformation of the figure that is not uniform in the longitudinal zones, without involving baric-circulation processes as an intermediate link. Thus, free (Chandler) and forced 12-month fluctuations of the pole position are considered from a single point of view, i.e., as resulting from the variabi- lity of the rotational regime of the Earth. The analysis of heliogeophysical data for 1900–2017 confirms the validity of the proposed relationship mechanism.

Keywords: Earth rotation, nutation, precession, instantaneous pole of rotation, Earth figure deformation, pole position fluctuations, free oscillations, forced oscillations, solar mag- netospheric control

Acknowledgments. The work is performed according to the Russian Government Pro- gram of Competitive Growth of Kazan Federal University and supported by the Shota Rustaveli National Science Foundation (project no. FR17 252).

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