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On High Frequency Polar Motion and Length of Day Variations

Published online by Cambridge University Press:  12 April 2016

K. Arfa-Kaboodvand  and
E. Groten
K. Arfa-Kaboodvand
Affiliation:
Darmstadt University of Technology, Institute for Physical Geodesy, Darmstadt, Germany
E. Groten
Affiliation:
Darmstadt University of Technology, Institute for Physical Geodesy, Darmstadt, Germany

Abstract

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The 0.042-day Earth rotation data (diurnal and semidiurnal) computed by the International GPS Service were used to analyze the daily/sub-daily variations of polar motion (PM) and length of day (LOD). Systematic and advanced spectral analytical investigations of the degree of periodic variability have been carried out. They show that the prominent periodical components can be found at the tidal frequencies of zonal, tesseral and sectorial waves. These investigations should give better insight into the physical processes, which influence Earth orientation (i.e. due to the atmospheric and oceanic motions, tidal forces etc.). It should be the basis for the detailed modeling of excitation functions in the sub-diurnal range of the high-frequency spectrum.

Type
Part 6. Daily and Subdaily Polar Motion
Information
International Astronomical Union Colloquium , Volume 178: Polar Motion: Historical and Scientific Problems , 2000 , pp. 545 - 554
Copyright
Copyright © Astronomical Society of the Pacific 2000

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