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Transformation of amplitudes and frequencies of precession and nutation of the earth’s rotation vector to amplitudes and frequencies of diurnal polar motion

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Abstract

The temporal change of the rotation vector of a rotating body is, in the first order, identical in a space-fixed system and in a body-fixed system. Therefore, if the motion of the rotation axis of the earth relative to a space-fixed system is given as a function of time, it should be possible to compute its motion relative to an earth-fixed system, and vice versa. This paper presents such a transformation. Two models of motion of the rotation axis in the space-fixed system are considered: one consisting only of a regular (i.e., strictly conical) precession and one extended by circular nutation components, which are superimposed upon the regular precession. The Euler angles describing the orientation of the earth-fixed system with respect to the space-fixed system are derived by an analytical solution of the kinematical Eulerian differential equations. In the first case (precession only), this is directly possible, and in the second case (precession and nutation), a solution is achieved by a perturbation approach, where the result of the first case serves as an approximation and nutation is regarded as a small perturbation, which is treated in a linearized form. The transformation by means of these Euler angles shows that the rotation axis performs in the earth-fixed system retrograde conical revolutions with small amplitudes, namely one revolution with a period of one sidereal day corresponding to precession and one revolution with a period which is slightly smaller or larger than one sidereal day corresponding to each (prograde or retrograde) circular nutation component. The peculiar feature of the derivation presented here is the analytical solution of the Eulerian differential equations.

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Authors and Affiliations

  1. Deutsches Geodätisches Forschungsinstitut, Alfons-Goppel-Strasse 11, 80539, Munich, Germany

    Burghard Richter

  2. Geodätisches Institut, Universität Stuttgart, Geschwister-Scholl-Strasse 24D, 70174, Stuttgart, Germany

    Johannes Engels & Erik Grafarend

Authors
  1. Burghard Richter
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  2. Johannes Engels
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  3. Erik Grafarend
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Correspondence to Burghard Richter.

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Richter, B., Engels, J. & Grafarend, E. Transformation of amplitudes and frequencies of precession and nutation of the earth’s rotation vector to amplitudes and frequencies of diurnal polar motion. J Geod 84, 1–18 (2010). https://doi.org/10.1007/s00190-009-0339-9

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  • DOI: https://doi.org/10.1007/s00190-009-0339-9

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