Empiric Models of the Earth's Free Core Nutation

Details Empiric Models of the Earth's Free Core Nutation Empiric Models of the Earth's Free Core Nutation

2009-08-13

arxiv.org/abs/0908.1825v1

Solar System Research, 2007, Vol. 41, No. 6, pp. 492-497

Physics

Geophysics

8 pages, 3 figures; minor update of the journal published version

Scientific paper

10.1134/S0038094607060044

Free core nutation (FCN) is the main factor that limits the accuracy of the modeling of the motion of Earth's rotational axis in the celestial coordinate system. Several FCN models have been proposed. A comparative analysis is made of the known models including the model proposed by the author. The use of the FCN model is shown to substantially increase the accuracy of the modeling of Earth's rotation. Furthermore, the FCN component extracted from the observed motion of Earth's rotational axis is an important source for the study of the shape and rotation of the Earth's core. A comparison of different FCN models has shown that the proposed model is better than other models if used to extract the geophysical signal (the amplitude and phase of FCN) from observational data.

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