Transcontinental Baselines and the Rotation of the Earth Measured by Radio Interferometry
Shapiro, I. I.; Robertson, D. S.; Knight, C. A.; Counselman, C. C.; Rogers, A. E. E.; Hinteregger, H. F.; Lippincott, S.; Whitney, A. R.; Clark, T. A.; Niell, A. E.; Spitzmesser, D. J.; Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge 02139; Haystack Observatory, Westford, Massachusetts 01886; Goddard Space Flight Center, Greenbelt, Maryland 20771; Jet Propulsion Laboratory, Pasadena, California 91103
Журнал:
Science
Дата:
1974
Аннотация:
Nine separate very-long-baseline interferometry (VLBI) experiments, carried out in 1972 and 1973 with radio telescopes 3900 kilometers apart, yielded values for the baseline length with a root-mean-square deviation about the mean of less than 20 centitneters. The corresponding fractional spread is about five parts in 10<sup>8</sup>. Changes in universal time and in polar motion were also detertnined accurately from these data; the root-mean-square scatter of these results with respect to those based on optical methods were 2.9 milliseconds and 1.3 meters, respectively. Solid-earth tides were apparently detected, but no useful estimate of their amplituide was extracted.
762.7Кб