New Solution for the Earth’s Free Wobble and Its Geophysical Implications

作     者：CHEN Wei SHEN Wenbin QIN Xiaofeng 

作者机构：School of Geodesy and Geomatics Wuhan University 129 Luoyu Road Wuhan 430079China State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University 129 Luoyu Road Wuhan 430079 China Key Laboratory of Geospaee Environment and Geodesy Ministry of Education Wuhan University 129 Luoyu Road Wu- han 430079China 

出 版 物：《Geo-Spatial Information Science》 (地球空间信息科学学报（英文）)

年 卷 期：2010年第13卷第1期

页      面：49-55页

学科分类：07[理学] 070203[理学-原子与分子物理] 070401[理学-天体物理] 0704[理学-天文学] 0702[理学-物理学] 

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) 

主　　题：triaxial Earth elliptic free polar motion variation of Chandler period frequency amplitude modulation 

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.