Computer Science
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jsrs.meet..184e&link_type=abstract
"Proceedings of the "Journées Systèmes de Référence Spatio-temporels 2007". Observatoire de Paris, 17-19 September 2007. Editor:
Computer Science
Scientific paper
The deformations of the Earth caused by the zonal part of the tidal potential induce fluctuations in the rotational speed of the Earth with periods from about 5 days to 18.6 years. Measures for the deviation of the Earth rotation from a uniform motion are the parameter dUT1 (defined as the difference between Universal Time UT1 and atomic time UTC) and its time derivative the length of day (LOD). LOD variations were derived from 23 years of VLBI observations, using the VLBI software package OCCAM61E. We also calculated a second LOD series of two years with the Bernese GPS Software 5.0 for the years 2005 and 2006, analysing data of 113 stations of the global IGS network. The atmospheric influence on LOD was computed from atmospheric angular momentum functions provided by the NCEP and subtracted from the original series. Different sets of tidal terms were estimated in a least squares adjustment introducing the remaining LOD variations as pseudo-observations. The resulting amplitudes were compared with the values of the model recommended in the IERS Conventions 2003 (Defraigne and Smits, 1999).
Englich Sigrid
Schuh Haral
Weber Richard R.
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