Characteristic of Chandler's polar wobble

Details Characteristic of Chandler's polar wobble Characteristic of Chandler's polar wobble

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979cha%26a..20..126w&link_type=abstract

Acta Astronomica Sinica, vol. 20, June 1979, p. 126-133. In Chinese, with abstract in English.

Astronomy and Astrophysics

Astronomy

Amplitude Modulation, Astronomical Spectroscopy, Fast Fourier Transformations, Polar Wandering (Geology), Spectrum Analysis, Data Reduction, Periodic Variations, Phase Shift, Photointerpretation, Polar Coordinates, Signal Processing

Scientific paper

The spectral analyses (FFT and periodgram method) of the Chandler's polar wobble from the observations between 1900.0 and 1969.9 years with the use of uniform data on polar coordinate exhibit four peaks in the spectra. Peaks were obtained at periods of 1.142, 1.169, 1.199 and 1.230 years. Amplitudes of two main peaks in the spectra (1.169 and 1.199 years) are equal. Fedorov and Yatskiv (1964) proposed that the phase change which occurred between 1924 and 1926 years was probably due to this phenomenon. This paper calculates the natural frequency of Chandler's polar wobble with the use of Fedorov's models and obtains natural period of the Chandler's wobble at 1.184 years. Interpretation of these multiple peaks with the use of modulation amplitude theory in expectation of the modulation oscillation with period about 48 years is given.

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