The semi-annual oscillation of polar motion and its atmospheric excitation in the period of 1979-1989

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Annual Variations, Earth Atmosphere, Earth Rotation, Laser Ranger/Tracker, Polar Wandering (Geology), Angular Momentum, Lageos (Satellite), Laser Interferometry, Very Long Base Interferometry

Scientific paper

Semiannual oscillations over the last ten years have been computed from pole coordinates determined from Lageos laser ranging data by the Center for Space Research (CSR). Equatorial component variations of the atmospheric excitation functions chi(1) and chi(2) of the NMC in the spectral range of a semiannual oscillation have been compared with values of the excitation function psi(1) and psi(2) from the CSR pole coordinate data. These estimations indicate some influence of atmospheric angular momentum variations on the semiannual oscillation of polar motion in the direction of the x-axis and a slightly stronger influence in the y-axis direction.

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