地球自由核章动相位跳变的探测及其与地磁急动的一致性
Detection of Phase Jumps of Free Core Nutation of the Earth and their Concurrence with Geomagnetic Jerks
摘要：
利用1984-2003年的VLBI观测数据，利用加权小波Z变换（WWZ）方法和加博函数短时周期图（SPG）方法，直接检测了地球自由核章动（FCN）的相位跳变。在此期间，FCN在1992年和1998年发生了两次重大的阶段性跳跃。这些时期与报告的地磁急动的发生相吻合。
英文摘要：
We detected phase jumps of the Free Core Nutation (FCN) of the Earth directly from the analysis of the Very Long Baseline Interferometer (VLBI) observation of the Earth rotation for the period 1984-2003 by applying the Weighted Wavelet Z-Transform (WWZ) method and the Short-time Periodogram with the Gabor function (SPG) method. During the period, the FCN had two significant phase jumps in 1992 and 1998. These epochs coincide with the reported occurrence of geomagnetic jerks.
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