Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990baicz..41..211v&link_type=abstract
Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 41, no. 4, July 1990, p. 211-220.
Astronomy and Astrophysics
Astronomy
4
Atmospheric Circulation, Earth Motion, Ground Water, Nutation, Frequency Distribution, Periodic Variations
Scientific paper
The polar motion excited by the atmosphere and groundwater storage (the latter being modeled by an annual term only) is integrated in the interval 1976.5-1988.0. It is found that better agreement with astronomically observed polar motion is obtained if the frequency of the free Chandler wobble is assumed to be variable in time and amplitude-dependent. The best fit in a least-squares sense in the whole interval is achieved if the Chandler frequency is approximated by the expression sigma = 0.01456 + 0.0033 e exp -20M rad/day, where M is the total polar motion amplitude in arcsec. The rms difference between the two motions is, in this case, equal to + or - 0.027 arcsec. The residual motion can probably be ascribed to the transfer of water mass with a near Chandler frequency.
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