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Folgueira, Marta and Dehant, V. and Lambert, S.B. and Rambaux, N. (2007) Impact of tidal Poisson terms on nonrigid Earth rotation. Astronomy & Astrophysics, 469 . pp. 11971202. ISSN 00046361

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Official URL: http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/00046361:20066822&Itemid=129
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http://www.edpsciences.org/  Publisher 
Abstract
Context. The tidal potential generated by bodies in the solar system contains Poisson terms, i.e., periodic terms with linearly timedependent amplitudes. The influence of these terms on the Earth's rotation, although expected to be small, is of interest for high accuracy modeling. Aims. Therefore, we study their contribution to the rotation of a nonrigid Earth with an elastic mantle and liquid core. Methods. Starting from Liouville's equations, and following an analytical treatment, we obtain the relations accounting for Poisson terms in the forcing and providing the solution for the wobble. Results. We show that the transfer function between rigid and non rigid nutation amplitudes, as usually defined in the literature, must be supplemented by additional terms proportional to the amplitude of the Poisson term of the potential. These new terms are inversely proportional to (sigma  sigma(N))(2) where sigma is the forcing frequency and sigma(N) are the eigenfrequencies associated with the retrograde free core nutation and the Chandler wobble. The highest contribution to the nutation is 6 mu as (Delta psi) on the term 2l'  2F + 2D  2 Omega and remains below 1 mu as for the other terms. A contribution of 88 mu as/cy is found to the obliquity rate. We evaluate the variations of the third component of the wobble of the Earth and of the core in response to a zonal tidal potential, and show that there is no significant change.
Item Type:  Article 

Uncontrolled Keywords:  Reference systems; Earth 
Subjects:  Sciences > Mathematics > Astronomy 
ID Code:  15346 
Deposited On:  24 May 2012 08:41 
Last Modified:  09 Aug 2018 11:51 
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