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Bulletin géodésique

, Volume 69, Issue 4, pp 308–319 | Cite as

Variability of polar motion oscillations with periods from 20 to 150 days in 1979–1991

  • W. Kosek
  • J. Nastula
  • B. Kołaczek
Article

Abstract

Variability of short period oscillations of polar motion with periods ranging from 20 to 150 days were investigated in the period 1979–1991. The new computation method of time variable band pass filter spectra and the Wavelet Transform method were applied. These oscillations are elliptical with variable amplitudes. Modulation periods of amplitude variations of these oscillations of about two and three years were found. Correlations of short period oscillations of polar motion and of effective atmospheric angular momentum (EAAM) excitation functions show annual variations and connections of their increases with El Niño phenomena.

Keywords

Excitation Function Earth Rotation Polar Motion Space Geodesy Atmospheric Angular Momentum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • W. Kosek
    • 1
  • J. Nastula
    • 1
  • B. Kołaczek
    • 1
  1. 1.Space Research Centre, PASWarsawPoland

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