High Frequency Fluctuations of Polar Motion During IGS'92 Campaign

Details High Frequency Fluctuations of Polar Motion During IGS'92 Campaign High Frequency Fluctuations of Polar Motion During IGS'92 Campaign

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994itn....16d..41h&link_type=abstract

Results from the SEARCH'92 Campaign. (IERS Technical Note; 16), Edited by J. O. Dickey and M. Feissel. Paris: Central Bureau of

Computer Science

Scientific paper

During IGS'92 Campaign seven PM(Polar Motion) series provided by GPS Processing Centers are analysed in this paper. Some similar high frequency fluctuations in these PM series are detected by using spectra! analyses, least square adjustment and F-test as follows: there are short periodic fluctuations of 27.0, 16.5, 13.4, 10.4 day in X direction; and of 10.0, 20.5, 15.8 day in Y direction. And there are similar systematic deviations derived from the comparison of each series with EOP(IERS) 92 C 04. The inain cause of these systematic deviations is that the rotation between the reference frames of these series and ITRF91 exists. As for the reason, the coordinates of stations are not fixed (or partly fixed only) when solving X and Y with GPS data. The high frequency fluctuations of polar motion are explained to some extent by the excitation of atmospheric angular momentum.

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