自由核章动频带内天极偏移观测的分析
An analysis of celestial pole offset observations in the free core nutation frequency band
摘要：
在这项研究中，三个经验的自由核心章动（FCN）模型发展到目前的时间，MHB 2000，马尔金和兰伯特的，比较的基础上表示的FCN振幅和相位的变化预测这些模型。可以得出结论，作者的模型提供了FCN变化的最真实的表示。然而，指定的模型是基于对单个FCN旋转模式的表示。与此同时，对VLBI观测资料的处理结果表明，可能存在两个接近的FCN周期。G. Krasinsky在他的两层液核地球自转理论中，ERA 2005。在本工作中，为了更详细地研究这一现象，IVS时间序列的天极偏移量，也是那些由ERA 2005理论预测，已调查了通过几种统计方法，确信存在两个波动的周期约为-452和-410太阳日的地球自转轴章动运动。
英文摘要：
In this study, three empirical Free Core Nutation (FCN) models developed to the present time, MHB2000, Malkin's and Lambert's ones, are compared on the basis of representation of variations of the FCN amplitude and phase predicted by these models. It is possible to conclude, that the model of the author provides the most realistic representation of the FCN variations. However, the specified models are based on representation about single FCN rotational mode. At the same time, some results of processing of the VLBI observations made during last years, specify possible presence of two close FCN periods. A theoretical explanation to presence of a second FCN frequency FCN has been given by G. Krasinsky in his theory of rotation of the Earth with two-layer liquid core, ERA2005. In the present work, for more detailed studying this phenomenon, the IVS time series of celestial pole offset, and also those predicted by the ERA2005 theory, have been investigated by means of several statistical methods which confidently show presence of two fluctuations in nutational movement of an Earth's rotation axis with the periods about -452 and -410 solar days.
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