Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26as...86..251i&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 86, no. 2, Dec. 1990, p. 251-257.
Astronomy and Astrophysics
Astrophysics
3
Annual Variations, Earth Rotation, Iris Satellites, Latitude Measurement, Time Measurement, Astrometry, Earthquakes, Geomagnetism, Lithosphere, Stress Propagation
Scientific paper
The residuals of the optical observations of time and latitude obtained at the IPMS collaborating stations for the period from 1967 to 1987, have been derived in this study by removing the effect of the earth's rotation and after elimination of artificial variations due to replacement and overhaul of the instruments and changes in the star observation system. To be free of seasonal variations, account is taken of the difference in the pole positions derived from the IRIS program and the IPMS of about 0.002 arcsec and 0.007 arcsec for x and y respectively, and of differences in UT1 - TAI of about -0.02 arcsec. Long-term variations of the residuals by a 6-year running mean are displayed; they show systematic variations at the Asian and the European stations.
Goto Yasuhiro
Ishii Hiroumi
Ishikawa Tadashi
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