Volume 34 Issue 12
Dec.  2009
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CHEN Wei, SHEN Wenbin. Amplitude-Frequency Modulation Mechanism of Chandler Wobble of Triaxial Earth[J]. Geomatics and Information Science of Wuhan University, 2009, 34(12): 1399-1402.
Citation: CHEN Wei, SHEN Wenbin. Amplitude-Frequency Modulation Mechanism of Chandler Wobble of Triaxial Earth[J]. Geomatics and Information Science of Wuhan University, 2009, 34(12): 1399-1402.
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Amplitude-Frequency Modulation Mechanism of Chandler Wobble of Triaxial Earth

  • 1School of Geodesy and Geomatics, Wuhan University,129 Luoyu Road,Wuhan 430079, China;2State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing,Wuhan University, 129 Luoyu Road,Wuhan 430079,China;3Key Laboratory of Geospace Environment and Geodesy, Ministry of Education,Wuhan University,129 Luoyu Road, Wuhan 430079,China

Funds: 地球空间环境与大地测量教育部重点实验室开放研究基金资助项目(08-02-02)；测绘遥感信息工程国家重点实验室专项科研经费资助项目；武汉大学优秀博士学位论文培育基金资助项目；国家863计划资助项目(2006AA12Z211)
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  • Received Date: October 15, 2009
  • Revised Date: October 15, 2009
  • Published Date: December 04, 2009
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    • Abstract
  • We study the theory of free wobble of the triaxial Earth and find that the Euler period should be actually expressed by the complete elliptic integral of first kind and 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. Due to the triaxiality of the Earth, there is a mechanism of the frequency-amplitude modulation in the Chandler wobble which might be a candidate to explain the correlation between the amplitude and the period of the Chandler wobble. We compared the theoretical polar parameters (m1,m2) with the observed values for the Chandler components obtained from the data EOP (IERS), and find that they coincide with each other quite well, especially in recent years. Moreover, a polar wander towards 77.98°W at the rate 3.93 mas/a was also obtained from the IERS data.
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