How large is the retrograde annual wobble?

Details How large is the retrograde annual wobble? How large is the retrograde annual wobble?

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1735k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Sept. 1991, p. 1735-1738.

Physics

4

Earth Rotation, Polar Wandering (Geology), Annual Variations, Power Spectra

Scientific paper

Recent measurements of polar motion (wobble) made by space-geodetic methods are compared with older optical measurements. Multitaper spectra of these data show that the retrograde (clockwise) annual wobble is much larger in the older data than the newer data, implying systematic errors in the older techniques. Two additional analyses show evidence for a small retrograde motion in the newer data, which appears to be consistent between data types. This implies that the excitation of the retrograde wobble must be about half of the prograde excitation. None of the available estimates of the excitation shows full agreement with these observations.

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