CONT05: High-Frequency Earth Rotations Variations from VLBI Observations

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The aim of this study is to obtain and analyse Earth Rotation parameters with high resolution from VLBI CONT05 company. One of main tasks of VLBI CONT05 company (continuous 15-day observations, 2005, September 12-26) is to study discrepancy between the models (tidal and atmospheric) and the observations at the M2 and S1 frequencies as well as between long-term and short-term values of tidal amplitudes. VLBI observations of 2005 year with 256 Mb/s recording and a network with larger geographical coverage the sub-daily precision should be better than previously CONT Campaigns (CONT94, CONT95, CONT96, CONT02), thus clarifying even more the deviations from the ocean tide model. Earth rotation time series with 1-hours and higher time resolution were obtained from VLBI data analysis with different methods (Kalman Filter with OCCAM package, Least Square Collocation method and Least Square method with QUASAR package) for verification of the results. Comparison of estimates of troposphere zenith delay across experiment boundaries permits to control the accuracy of the observations and analysis. The results of different spectral tools and wavelet analysis will be present as well as the results of comparison with previously CONT Campaigns.

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