Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..16e..69k&link_type=abstract
Nomenclature, Precession and New Models in Fundamental Astronomy, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 200
Astronomy and Astrophysics
Astronomy
Scientific paper
The main goal of our study is to investigate the coherence between geodetic and geophysical excitation of polar motion. For this purpose a new 15-year time series of the Earth rotation parameters (polar motion and universal time UT1) with sub-diurnal resolution has been derived from the very long baseline interferometry (VLBI) observations by the least square collocation method. The method of complex demodulation has been applied in order to extract from the polar motion series a signal in the prograde diurnal frequency band. This signal is used to estimated the so-called 'geodetic excitation' which is then compared to the available sub-diurnal estimates of the atmospheric (NCEP/ NCAR reanalysis project) and oceanic angular momenta (kindly provided us by Dr. R.M. Ponte). Correlation analysis shows that agreement between VLBI and AAM data better in case of the non-IB assumption. Accounting for OAM signals slightly increase fit to the VLBI in comparison to the fit obtained with AAM data alone. Nonetheless, parameters of the S1 term derived from VLBI data reveal the better agreement with those one obtained from pressure term of AAM data (see table below).
Brzeziński Aleksander
Kudryashova M. V.
Petrov D. S.
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