地球内核的动力学理论及章动效应

Dynamic theory of the Earth's inner core and nutation efficiency

地球固体内核与其其余部分之间的引力和压力的耦合作用将引起一内力矩 ,内核通过这一力矩影响岩石圈相对惯性空间的定向 .讨论了一个弹性无海洋、球形分层的内核地球章动理论 ,将内核的作用明确地反映在公式中 .并依据Mathewsetal的内核地球动力学理论 ,讨论了归一化章动振幅的Mathews形式和Wahr形式的应用 ;通过PREM地球模型检测了内核对章动振幅的影响 ,由此发现本文的结果与Mathewsetal的结果存在一定的差异 。

There exist relationship between the Earth's inner core and the Earth's rotation.Because of the inner core of the Earth,there will have two new nutation modes related to the Earth's rotation,i.e.a prograde free core nutation (PFCN) mode and a inner core wobble (ICW) mode.Based on the inner core nutation theory of the Earth by Mathew's et al the applications of normaliged nutation amplitude of Mathew's type and Whar's one are discussed,By the PREM Earth's model,the influence of the inner core to the vibration rangeof nutation is checked,the main solution is that the inner core has effects to the main nutation terms in 0.1?mas,which is coincide with recent observation precision.