从分析laser到LAGEOS ~1和LAGEOS ~2，地球位系数$J_2$和动力学Love数$k_2^d$的大变化
Large Variations of the coefficient $J_2$ of geopotential, and the dynamical Love number $k_2^d$ from the analysis of laser ranging to LAGEOS~1 and LAGEOS~2
摘要：
通过对LAGEOS~1（1988- 2003）和LAGEOS~2（1992- 2003）激光测距资料的分析，研究了地球位系数$J_2$的长期和季节变化。结果表明，除了已知的振幅为$\approx 2.5 \times 10^{-10}$的年际变化外，还存在非常显著的振幅相当的半年变化。这两种模式的相位是这样的，总的影响可以被描述为$J_2$在8月的急剧正飞溅和相当小的变化在一年的其余部分。
英文摘要：
Secular and seasonal variations of the coefficient $J_2$ of the geopotential are studied from the analysis of laser measurements of distances to the geodetic satellites LAGEOS~1 (1988--2003) and LAGEOS~2 (1992--2003). It is confirmed that beside the well-known annual variations with the amplitude $\approx 2.5 \times 10^{-10}$ there also exist very significant semi-annual variations of a comparable amplitude. Phases of these two modes are such that the total effect may be described as a sharp postive splash of $J_2$ in August and considerably smaller variations in the rest part of year.
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