A New Free Core Nutation Model with Variable Amplitude and Period

Details A New Free Core Nutation Model with Variable Amplitude and Period A New Free Core Nutation Model with Variable Amplitude and Period

2004-07-30

arxiv.org/abs/physics/0407153v1

In: IVS 2004 General Meeting Proc., Eds. N. R. Vandenberg, K. D. Baver, NASA/CP-2004-212255, 2004, 388-392

Physics

Geophysics

6 pages, 5 figures; presented at the IVS 2004 General Meeting, Ottawa, Canada, February 9-11, 2004

Scientific paper

Three most long and dense VLBI nutation series obtained at the Goddard Space Flight Center, Institute of Applied Astronomy, and U.S. Naval Observatory were used for investigation of the Free Core Nutation (FCN) contribution to the celestial pole offset. Some recent studies have showed that the FCN period or/and phase does not remain constant, but varies in a rather wide range of about 410--490 days (for equivalent period). To implement this result in the practice, a new FCN model with variable amplitude and period (phase) is developed. Comparison of this model with observations shows better agreement than existing one. After correction of the differences between observed VLBI nutation series and the IAU2000A model, they decreased to a level about 100 microarcseconds.

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