摘要
In this paper, the theory of the free wobble of the triaxial Earth is developed and new conclusions are drawn: the Euler period should be actually expressed by the first kind of complete elliptic integral; the trace of the free polar motion is elliptic and the orientations of its semi-minor and major axes are approximately parallel to the Earth's principal axes A and B, respectively. In addition, the present theory shows that there is a mechanism of frequency-amplitude modulation in the Chandler wobble, which might be a candidate for explaining the correlation between the amplitude and period of the Chandler wobble.
In this paper, the theory of the free wobble of the triaxial Earth is developed and new conclusions are drawn： the Euler period should be actually expressed by the first kind of complete elliptic integral the trace of the free polar motion is elliptic and the orientations of its semi-minor and major axes are approximately parallel to the Earth＇s principal axes A and B, respectively. In addition, the present theory shows that there is a mechanism of frequency-amplitude modulation in the Chandler wobble, which might be a candidate for explaining the correlation between the amplitude and period of the Chandler wobble.
基金
Supported by the Special Project Fund of State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing (China)
the Engagement Fund of Outstanding Doctoral Dissertation of Wuhan University (No.22)
the Ph.D. Candidates Self-research (including 1+4) Program of Wu-han Unversity in 2008 (No.49)
the Open Fund of Key Laboratory of Geospace Environment and Geodesy, Ministry of Education,China (No.08-02-02)
