Short-period variations of the Earth rotation parameters as seen by VLBI.

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Modern geodetic VLBI experiments provide very accurate results of polar motion and UT1-UTC. More than 300 VLBI experiments (NEOS-A from 1993 till 1998, CONT'96, CORE) were analysed by the OCCAM 3.4 VLBI software using the least-squares collocation method (LSCM). The LSCM allows to estimate the Earth rotation parameters with a temporal resolution of 3 - 7 minutes. Wavelet transformations of the UT1-UTC and polar motion time series obtained by the VLBI solutions were done. Several irregular quasi-periodic variations were found besides the well known diurnal and semidiurnal periods. In many UT1-UTC data sets periods around 8 hours and between 5 and 7 hours can be seen. The results of two parallel VLBI sessions which took place since 1998 were compared in the high-frequency range. The wavelet analysis reveals interesting patterns in polar motion, too.

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