Celestial Motion of Earth's Spin Axis Derived From the Combination of VLBI and GPS Observations

Details Celestial Motion of Earth's Spin Axis Derived From the Combination of VLBI and GPS Observations Celestial Motion of Earth's Spin Axis Derived From the Combination of VLBI and GPS Observations

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.g34a..08v&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #G34A-08

Astronomy and Astrophysics

Astronomy

1229 Reference Systems, 1239 Rotational Variations, 1294 Instruments And Techniques

Scientific paper

The motion of Earth's spin axis in space is monitored by VLBI, and since 1994 also its rate is measured by GPS. The method of "combined smoothing", developed recently at the Astronomical Institute in Prague, enables to combine both series. The solution, based on observations in 1979.6-2004.5, is compared with the recently adopted IAU2000 model of precession-nutation. The analysis reveals statistically significant deviations from the model. These differences can be identified with free core nutation (FCN) and several forced nutation terms.

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