摘要
本文根据勒夫数和负荷勒夫数的扰动原理,采用PREM弹性地球模型和Zschau的地幔流变模型,讨论了地幔滞弹性对弹性地球的平衡极潮的扰动,及其对Chandler摆动周期和Q值的影响.计算结果表明,平衡极潮的滞弹扰动对Chandler摆动的影响远比极潮中非平衡部分的影响大,但它仍在目前天文实测值的误差范围内.
According to the perturbation principle of the Love numbers and load Love numbers, the perturbation of mantle anelasticity on the equilibrium pole tide of the elastic Earth and its effest on the period and Q value of the Chandler wobble are discussed by using the elastic Earth model PREM and Zschau's mantle rheology model. The results obtained show that the perturbation of mantle anelasticity makes the amplitude of the equilibrium pole tide of the elastic Earth decrease by about 1.4 percent, and induces a small phase advance. Its effect on the Chandler wobble is much larger than that of the non-equilibrium part of the pole tide, but it is still in the range of error of the present observed values. The theoretical period and Q of the Chandler wobble are 434.8 days and 71 respectively for an elliptical and rotating Earth which has an anelastic mantle, a fluid core and an equilibrium pole tide. This is in good agreement with most of the astronomical observations.
出处
《天文学报》
CSCD
北大核心
1992年第4期420-426,共7页
Acta Astronomica Sinica
