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Atmospheric Angular Momentum Variations and Diurnal Polar Motion

Published online by Cambridge University Press:  12 April 2016

V.E. Zharov  and
S.L. Pasynok
V.E. Zharov
Affiliation:
Sternberg Astronomical Institute, Universitetskij prospect, 13, 119899 Moscow
S.L. Pasynok
Affiliation:
Sternberg Astronomical Institute, Universitetskij prospect, 13, 119899 Moscow

Abstract

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The atmospheric effective angular momentum functions were used to study the excitation of the diurnal polar motion and nutation. The main effect on polar motion at the frequency of the S1 tide is up to 10 µas, and on the annual prograde nutation term is up to 0.1 mas. The atmosphere and viscosity of the outer core of the Earth were taken into account in calculating the transfer function.

The atmosphere treated as a thin rotating layer gives two new eigen-modes or two new resonance frequencies in the Earth’s transfer function, and one of them is in the diurnal frequency band. Viscosity of the fluid outer core and choice of the Earth’s model change the nearly diurnal frequencies of the normal modes.

Type
Part 6. Daily and Subdaily Polar Motion
Information
International Astronomical Union Colloquium , Volume 178: Polar Motion: Historical and Scientific Problems , 2000 , pp. 555 - 564
Copyright
Copyright © Astronomical Society of the Pacific 2000

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