15 Astronomical and Geophysical Factors of the Perturbed Chandler Wobble …
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Fig. 15.8 Estimates of the polar angle variations: a comparison between the variations of the
polar angle ϕ isolated from the observed Earth pole trajectory (black line), its approximation (red
line), variations of the polar angle ϕ using a two-frequency model with constant coefficients (gray
line), and the calculated Earth pole trajectory taking into account the atmospheric and oceanic
perturbations (blue line) and b a graph of oscillations of the deviation angle δ along the equator of
the point of intersection of the equator with the lunar orbit
in geomedia can be caused not so much by internal perturbations as by external
disturbances for the Earth.
Acknowledgements This work was carried out within the basic part of the state task of the Ministry
of Education and Science of the Russian Federation (project no. 721).
References
1. International Earth rotation and reference systems service—IERS annual reports, https://www.
iers.org. Last accessed 9 Sept 2020
2. Markov, Y.G., Mikhaylov, M.V., Lar’kov, I.I., Rozhkov, S.N., Krylov, S.S., Perepelkin, V.V.,
Pochukaev, V.N.: Fundamental components of the parameters of the Earth’s rotation in forming
215
Fig. 15.8 Estimates of the polar angle variations: a comparison between the variations of the
polar angle ϕ isolated from the observed Earth pole trajectory (black line), its approximation (red
line), variations of the polar angle ϕ using a two-frequency model with constant coefficients (gray
line), and the calculated Earth pole trajectory taking into account the atmospheric and oceanic
perturbations (blue line) and b a graph of oscillations of the deviation angle δ along the equator of
the point of intersection of the equator with the lunar orbit
in geomedia can be caused not so much by internal perturbations as by external
disturbances for the Earth.
Acknowledgements This work was carried out within the basic part of the state task of the Ministry
of Education and Science of the Russian Federation (project no. 721).
References
1. International Earth rotation and reference systems service—IERS annual reports, https://www.
iers.org. Last accessed 9 Sept 2020
2. Markov, Y.G., Mikhaylov, M.V., Lar’kov, I.I., Rozhkov, S.N., Krylov, S.S., Perepelkin, V.V.,
Pochukaev, V.N.: Fundamental components of the parameters of the Earth’s rotation in forming