Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sosyr..38..476m&link_type=abstract
Solar System Research, Volume 38, Issue 6, pp.476-490
Astronomy and Astrophysics
Astronomy
Scientific paper
The use of very-long-baseline radio interferometers during the past 10 15 years has increased the accuracy of amplitude measurements of the Earth’s forced nutation by more than two orders of magnitude (from 3 5 arc ms to 20 arc μs). At the same time, cryogenic gravimeters (which depend for their action on the repulsion of two superconductive rings in a gravitational field) have made it possible to also improve the accuracy of measurements of tidal variations in the gravitational force by two orders of magnitude. This opens up new avenues for the investigation of the mechanical properties of the Earth’s interior at ultralow frequencies. A brief review is given here of the basic results of interpreting astrometric data and measurements of tidal variations in the gravitational force. Problems suggested by the new observational techniques are formulated.
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