对钱德勒摆动椭率及长轴方向的检测  

DETECTION OF THE ELLIPTICITY AND THE DIRECTION OF LONG AXIS OF THE CHANDLER WOBBLE

作　　者：高布锡[1] 

机构地区：[1]中国科学院测量与地球物理研究所动力大地测量开放实验室

出　　处：《天文学报》1999年第2期139-141,共3页Acta Astronomica Sinica

基　　金：中国科学院95重点资助

摘　　要：证明地球的三轴性对钱德勒摆动椭率的影响只有１．８Ｅ５，，可以被忽略．假定极潮为平衡潮，求出由于海陆分布的影响，将使钱德勒摆动有０．０１３的椭率，主轴方向大约指向东经６°．采用傅里叶反卷积方法对ＳＰＡＣＥ９２和ＢＩＨ的极移资料进行分析，求出逐年的长期极移、周年极移和钱德勒摆动的参数，然后将钱德勒摆动归算到同一历元，证明钱德摆动椭率约为０．０１１，长轴方向约为东经９°，与理论结果十分符合．This paper firstly demonstrates that the Earth's dynamic three axial ellipsoid has only a small effect on the elliptic movement of the Chandler wobble (CW), whose ellipticity is 1.8E 5 and may be neglected. Taking into consideration that the ocean land distribution is not symmetric and assuming that the polar tide is in equilibrium, the author has proved that the CW is an elliptic movement with an ellipticity of 0.013 and the direction of the long axis is at 6° E. By using the deconvolution method in Fourier analysis, the parameters of long trend and annual polar motions and CW for every year are determined. In order to reduce the CW parameters to one and the same epoch, the ellipticity of CW is taken to be 0.011 and the direction of long axis lies along 9° E, and these agree very well with theoretical results.

关 键 词：椭率 长轴方向 钱德勒摆动 地球运动 地球动力学 

分 类 号：P183.3[天文地球—天文学] P541