Results 111 to 120 of about 201 (152)

Anomalies of the Chandler Wobble in 2010s

Moscow University Physics Bulletin, 2022
The Earth's rotation is nonuniform: the position of the pole drifts and describes circles with the annual and Chandler (433 days) periods; the Earth's rotation velocity also varies. In the beginning of 2000s, the amplitude of the Chandler wobble began to decrease and in 2017-2020 reached a historical low comparable only with the low of late 1920s.
Zotov, L., Sidorenkov, N., Bizouard, Ch.
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On the Ellipticity of the Chandler Wobble

Publications of the Astronomical Society of Japan, 1977
Abstract On the basis of the assumption of the statistically stationary random process for the excitation of the Chandler wobble with the constant effective damping coefficient α, the statistical relations are derived for the spectral densities and powers of the wobble. It is then shown for the real Earth that the non-isotropic component
Isao Okamoto, Tetsuo Sasao
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Characteristics of the chandler wobble

Chinese Astronomy, 1980
Abstract We carried out a spectral analysis (by FFT and periodograms) on a homogenized set of data of coordinates of the Earth's pole in the period 1900–1969.9, and found the Chandler wobble to have 4 peaks at periods of 1.142, 1.169, 1.199 and 1.230 years. The two main peaks at 1.169 and 1.199 years have equal amplitudes (TABLE 4 and Fig.
Wu Shou-Xian, Wang Shu-he, Hua Ying-min
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Period variations of the Chandler wobble

Journal of Geodesy, 2003
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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The status of Chandler wobble

2020
<p>The Chandler wobble (CW) and Annual wobble (AW) are the main components of the Earth’s Polar motion, which play an important role in our understanding of their excitations. The Fourier Basis Pursuit Band-Pass Filtering (FBPBPF) method, which can effectively suppress the edge effect, are applied to extract the CW ...
Guocheng Wang, Lintao Liu, Jinzhao Liu, Yi Tu   +3 more
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Variations in the amplitude of the chandler wobble

Izvestiya, Physics of the Solid Earth, 2009
It is shown that within the framework of the Kolmogorov model the “energy” of the pole E(t) = x 1 2 + x 2 2 can be interpreted as a Markovian process. The exact analytical expression has been obtained for the density of the conditional probability of the quantity E(t) and the problem of the first passage time of the process E(t) has been analyzed.
I. Ya. Tsurkis, E. A. Spiridonov
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Spectral Analyses of the Chandler Wobble

Symposium - International Astronomical Union, 1972
Spectral analyses of 70 yr of ILS-IPMS data on the variation of latitude are discussed from the point of view of the confidence limits that can be placed on statistical estimates. The available data cannot be used to support the existence of two resonant frequencies in the Chandler wobble, nor are the latter required to remove an anomaly in the value ...
G. P. H. Pedersen, M. G. Rochester
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Geophysical Excitation of the Chandler Wobble Revisited

2011
The 14-month Chandler wobble is a free motion of the pole excited by geophysical processes. Several recent studies demonstrated that the combination of atmospheric and oceanic excitations contains enough power at the Chandler frequency and is significantly coherent with the observed free wobble.
Brzezinski, A., Dobslaw, H., Dill, R., Thomas, M.   +3 more
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Variations of the amplitude of the Chandler wobble

Astronomy Reports, 2002
The main force and parametric actions on oscillations in the Earth-Moon system are compared. Parametric excitations due to external periodic changes in the distance between the Earth’s and Moon’s centers of mass occur in a limited number of frequency intervals. We demonstrate the role of a nonlinear parameter that limits the oscillation amplitudes, and
G. S. Kurbasova, L. V. Rykhlova, M. N. Rybalova   +2 more
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Oceanic excitation of the chandler wobble

Advances in Space Research, 2002
We estimate the oceanic contribution to the excitation of the Chandler wobble using an 11-year time series of ocean angular momentum. The time domain comparison of this series with the non-atmospheric excitation inferred from the polar motion and atmospheric angular momentum data shows a high correlation over most of the period of 1985 to 1996 when ...
Aleksander Brzeziński, Jolanta Nastula
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