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Diurnal and Sub-diurnal Terms of Nutation

Published online by Cambridge University Press:  12 April 2016

Aleksander Brzeziński
Aleksander Brzeziński*
Affiliation:
Space Research Centre, Polish Academy of Sciences, Bartycka 18A, 00-716 Warsaw, Poland e-mail: alek@cbk.waw.pl

Abstract

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This paper discusses the short-period terms of nutation which are included in the recent theories of nutation for a rigid Earth. We argue that these terms should be expressed as terrestrial perturbations, that is as polar motion, and describe how such a transformation can be accomplished in practice. Based on the available rigid-Earth amplitudes, we estimate this lunisolar effect in polar motion for an elastic Earth with liquid core, and compare it to the oceanic and atmospheric perturbations at similar frequencies.

Type
Section 2. Improved Definitions and Models
Information
International Astronomical Union Colloquium , Volume 180: Towards Models and Constants for Sub-Microarcsecond Astrometry , March 2000 , pp. 171 - 181
Copyright
Copyright © US Naval Observatory 2000

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