High Frequency Oscillations of the Celestial Ephemeris Pole by Variations of the Effective Angular Momentum Function
The motion of the CEP is conventionally described by four among five the so-called Earth Orientation Parameters (EOP). Two of them, x, y, express displacement of the CEP from the terrestrial pole and the other two, dψ, dε, express the celestial offset of the CEP with respect to the position predicted by the conventional IAU precession/nutation models. These parameters are routinely determined by modern space techniques with spatial and temporal resolution approaching the level of 0.1 mas (milliarcsecond) and a few hours, respectively. At the same time we observe also a significant improvement of quality of the related geophysical data, example being the regular estimates of the atmospheric EAM function χ (IERS Annual Reports).
KeywordsEarth Rotation Polar Motion High Frequency Oscillation Earth Orientation Parameter Love Number
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