Empiric Models of the Earth's Free Core Nutation

Abstract

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.

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

References in corpus (2)

• Detection of Phase Jumps of Free Core Nutation of the Earth and their Concurrence with Geomagnetic Jerks
• Parameters of the Free Core Nutation from VLBI Data

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• The impact of celestial pole offset modelling on VLBI UT1 Intensive results
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• National Report for the International Association of Geodesy of the International Union of Geodesy and Geophysics 2011-2014
• Free core nutation: new large disturbance and connection evidence with geomagnetic jerks