Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989itim...38..676s&link_type=abstract
(Society of Instrument and Control Engineers of Japan, IEEE, URSI, et al., Conference on Precision Electromagnetic Measurements,
Astronomy and Astrophysics
Astronomy
3
Earth Rotation, Extragalactic Radio Sources, Radio Interferometers, Radio Telescopes, Very Long Base Interferometry, Iterative Solution, Phase Deviation, Polar Wandering (Geology), Power Spectra
Scientific paper
The VLBI project for international radio interferometric surveying (IRIS) is presented. It involves three stations in the United States and two radio telescopes in Europe. The IRIS experiments provide all of the earth orientation parameters, baseline components, extragalactic radio source positions, and parameters of geophysical and astronomical models. For the investigation of the short periods of polar motion, the pole path observed within project IRIS since January 1984 was analyzed in the along-track and cross-track components. Both components contain variations with periods of about 13.7 days. A comparison of the phases shows that the fortnightly variation of the cross-track components can be related to the variation of the tidal potential with a phase lag of about one day. The largest variations were found in the along-track pole components, with an average period of about 10.8 days. This confirms the assumption recently made by several authors that the short-period variations in global atmospheric data-with periods of 10-12 days - influence the motion of the pole.
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