On the Effects of Solution Types on Clock and Atmosphere Parameters

Details On the Effects of Solution Types on Clock and Atmosphere Parameters On the Effects of Solution Types on Clock and Atmosphere Parameters

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001evga.conf..137n&link_type=abstract

Proceedings of the 15th Workshop Meeting on European VLBI for Geodesy and Astrometry. Institut d'Estudis Espacials de Catalunya,

Astronomy and Astrophysics

Astronomy

Scientific paper

When comparing VLBI derived earth orientation parameters (EOP) with those of the IERS C04 series, significant differences are discernible in the period between 1984 and 1989. In an attempt to unravel the reasons of the apparently systematic behaviour of the EOP, we investigate possible differences in atmosphere and clock parameters estimated in a so-called TRF solution and in a solution where station coordinates are adjusted in each session independently. The differences between the two solutions clearly show an increased scatter in both the clock and the atmosphere parameters before the late 1980's deminishing abruptly at about August 1989. Further investigations of possible causes for these differences have so far not produced any results.
An analysis of data from 1990 onwards averaged over the individual months of year does not produce any conclusive evidence for seasonal dependencies.

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