地球自由章动(free nutation of the Earth)是地球自转轴的一种摆动。除受日、月引力变化的影响外,还由于地球自转的主动量矩方向(俗称自转轴方向)与地球的中心惯量椭球的短轴(或称形状轴)不相重合,因而其自转轴在地球内部以地球质心为顶点,沿着一个张角约1秒的锥面绕短轴转动。
根据地球自由核章动在周日重力潮汐观测中的共振效应确定了自由核章动的复本征周期和品质因子Q 值,研究了极移重力效应;
The complex eigen period period and Q value of the FCN are evaluated based on the resonance observed in the diurnal tidal gravity, the gravity change due to the polar motion is also studied.
由于内核的存在,将出现两个新的与地球自转有关的章动模式,即顺向的自由核章动(PFCN)和内核摆动(ICW)模式。
Because of the inner core of the earth, there will have two nutation modes related to the earth's rotation, i. e. a prograde free core nutation (PFCN) mode and a inner core wobble (ICW) mode.
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