Spectral analysis of the diurnal nonuniformity of the earth's rotation

Astronomy and Astrophysics – Astronomy

Scientific paper

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Angular Velocity, Diurnal Variations, Earth Rotation, Spectrum Analysis, Amplitude Distribution Analysis, Fast Fourier Transformations, Signal To Noise Ratios

Scientific paper

The diurnal nonuniformity of the rotation of the earth is studied on the basis of astronomical observations by the International Time Service from 1968 to 1978. The short-term changes of the angular velocity of the earth were calculated by obtaining several clock corrections; the resulting amplitude spectrum is given diagrammatically. The standard fast-Fourier-transformation program was used with the largest number of ordinates 2N=8192; longer series of up to 2N=29,000 are also considered. Tables of the characteristics of the harmonics found, and the diurnal and semidiurnal waves obtained from the data from three observatories are provided.

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