Linear drift and periodic variations observed in long time series of polar motion |
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| Authors: | H Schuh S Nagel T Seitz |
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| Institution: | Institut für Geod?sie und Geophysik, Techn. Univ. Wien, Gusshausstr. 27-29, A-1040 Wien, Austria e-mail: hschuh@luna.tuwien.ac.at; Tel.: +43-1-58801-12860; Fax: +43-1-58801-12896, AT
Deutsches Geod?tisches Forschungsinstitut (DGFI), Marstallplatz 8, D-80539 München, Germany, DE
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| Abstract: | Two long time series were analysed: the C01 series of the International Earth Rotation Service and the pole series obtained
by re-analysis of the classical astronomical observations using the HIPPARCOS reference frame. The linear drift of the pole
was determined to be 3.31 ± 0.05 milliarcseconds/year towards 76.1 ± 0.80° west longitude. For the least-squares fit the a priori correlations between simultaneous pole coordinates x
p
, y
p
were taken into account, and the weighting function was calculated by estimating empirical variance components. The decadal
variations of the pole path were investigated by Fourier and wavelet analysis. Using sliding windows, the periods and amplitudes
of the Chandler wobble and annual wobble were determined. Typical periods in the variable Chandler wobble and annual wobble
parameters were obtained from wavelet analyses.
Received: 21 January 2000 / Accepted: 28 August 2000 |
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| Keywords: | : Polar motion Chandler wobble Wavelet analysis |
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