Direct measurement of diurnal polar motion by ring laser gyroscopes

Details Direct measurement of diurnal polar motion by ring laser gyroscopes Direct measurement of diurnal polar motion by ring laser gyroscopes

2004-06-30

arxiv.org/abs/physics/0406156v1

J.Geophys.Res. 109 (2004) B06405

Physics

Geophysics

5 pages, 4 figures, agu2001.cls

Scientific paper

10.1029/2003JB002803

We report the first direct measurements of the very small effect of forced diurnal polar motion, successfully observed on three of our large ring lasers, which now measure the instantaneous direction of Earth's rotation axis to a precision of 1 part in 10^8 when averaged over a time interval of several hours. Ring laser gyroscopes provide a new viable technique for directly and continuously measuring the position of the instantaneous rotation axis of the Earth and the amplitudes of the Oppolzer modes. In contrast, the space geodetic techniques (VLBI, SLR, GPS, etc.) contain no information about the position of the instantaneous axis of rotation of the Earth, but are sensitive to the complete transformation matrix between the Earth-fixed and inertial reference frame. Further improvements of gyroscopes will provide a powerful new tool for studying the Earth's interior.

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