High-frequency variations in the rotation of the earth

Details High-frequency variations in the rotation of the earth High-frequency variations in the rotation of the earth

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985itgrs..23..369c&link_type=abstract

IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892), vol. GE-23, July 1985, p. 369-372.

Physics

5

Earth Rotation, Time Measurement, Very Long Base Interferometry, Ground Stations, Networks, Periodic Variations, Time Series Analysis

Scientific paper

Observational results are reported here demonstrating that a three-station network of properly distributed VLBI observatories can routinely determine UT1 with a formal standard error of + or - 0.05 ms of time, in an observing period of 24 h. Also reported are the results of a three-month series of daily observing sessions of only 1-h duration with a single interferometer, which produced estimates of UT1 with standard errors of + or - 0.1 ms. The UT1 values obtained from the 1-h observing sessions track smoothly between the points of the 24-h time series, and the combined time series shows that it is not unusual for UT1 to vary by 1-2 ms in periods of several days. Preliminary results of reprocessing the 24-h observing sessions in 2-h segments suggest that variations of 0.4 ms may occur on time scales of only 6-8 h.

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