Tri-frequency spectrum method and results for resolving the parameters of Earth’s liquid core free nutation |
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Authors: | Xiange Lei and Houze Xu |
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Institution: | (1) Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, 430077 Wuhan, China |
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Abstract: | The parameters of Earth free core nutation (FCN) are two relatively significant geophysical parameters. Sasao et al. (1980)
and Wahr and Bergen (1986) provided the theoretical estimation values of FCN parameters. Gwinn, Herring and Shapiro (1987)
first obtained the observational values of FCN parameters by very long base Interference (VLBI) at Cambridge University. In
the same year, Neuberg and Zürn in former West Germany and Hinderer in France began to retrieve FCN parameters by the observation
of gravity tides and introduced the stacking method. The other scholars who researched into the same geophysical problems
by applying the data of gravity tides basically followed the stacking method. The results they reached were similar to the
observational result of FCN parameters given by Neuberg et al. in 1987. But the observational results of FCN parameters gained
from gravity tides were not identical with those from VLBI, mainly because of the large difference of quality of FCN. So there
was not an affirmative observational result of FCN parameters since then. In this paper, The authors firstly introduce the
tri-frequency spectrum method with clearly geometrical and geophysical meaning for the resolution of FCN parameters, and the
observational results of FCN parameters obtained from tide data at three superconducting gravity stations were accordant with
those from VLBI, which will be relatively important to arriving at a certain observational result of FCN parameters. |
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Keywords: | gravity tides very long base interference (VLBI) gravity tide resonance of the earth’ s liquid core amplitude and phase frequency parameter amplitude and phase frequency spectrum extend range of amplitude frequency parameter FCN parameters |
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