Determination of Forced Diurnal Polar Motion Using Large Ring Lasers Gyroscopes

Details Determination of Forced Diurnal Polar Motion Using Large Ring Lasers Gyroscopes Determination of Forced Diurnal Polar Motion Using Large Ring Lasers Gyroscopes

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.g22b0311r&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #G22B-0311

Physics

1210 Diurnal And Subdiurnal Rotational Variations, 1239 Rotational Variations, 1294 Instruments And Techniques

Scientific paper

In October 2001, a very large ring laser gyroscope with an area of 16~m2 was inaugurated at the Fundamental Station in Wettzell, Bavaria. Large gyroscopes with areas of 1~m2, 16~m2, and 367~m2 are also operational at the University of Canterbury in Christchurch, New Zealand. These ring lasers, measuring the frequency difference between two counter-rotating laser beams, are now approaching a precision of 10~ppb for geophysical signals with periods of less than 2~days and therefore allow the monitoring of variations in Earth rotation (polar motion and length of day) in the high-frequency spectrum. For the first time, forced diurnal polar motion (also called "Oppolzer terms", caused by the gravitational attraction of Sun and Moon) with variations up to 20~mas (60~cm on the Earth's surface) can directly be measured. This is a novelty, because with the space geodetic techniques like VLBI, GPS, SLR/LLR, and DORIS, nutation and forced diurnal polar motion cannot be separated. With a few months of data stemming from the two most accurate ring lasers, the amplitudes of the largest terms of forced diurnal polar motion have been determined with a precision of about 1~mas. The results are discussed and compared to theoretical models.

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