由天文测时资料推算洛夫数K

DETERMINATION OF THE LOVE NUMBER K FROM THE UT1 SERIES

用自回归谱的Ｍａｒｐｌｅ算法，分析了１９６２．０至１９９４．０年间ＵＴ１序列，得到了与理论值非常接近的潮汐短周期项Ｍｆ、Ｍｍ波的谱峰，并计算了洛夫数Ｋ值，结果为ＫＭｍ＝０．３１０±０．００９，ＫＭｆ＝０．３１４±０．００９。本文还利用该测时资料求出地球自转速率的准两年变化，并导出激发函数ψ３的相应变化，从而获得了全球纬向风两年变化特性的一些结论。

In this paper, the UT1 series during the period of 1962.0 to 1982.0 calculated by Li Zhengxin, the BIH UT1 series (1967.0 to 1988.0) and the IERS UT1 series (1988.0 to 1994.0) are connected into a long one, from which the fortnightly (Mf) and monthly (Mm) waves are analyzed by using the method of Marple estimate. The Love numbers k are also determined by using two methods of correlation and least square respectively: (K Mf )cor=0.320,(K Mf )lea=0.308, (K Mm )cor=0.313,(K Mm )lea=0.307. The average results are :K Mf =0.314, K Mm =0.310,which agree with the previous studies. The variations of K Mf and K Mm are also studied here, from which we can see K Mm is more stable than K Mf because of the existence of the perturbations in the same range of fortnightly wave caused by geophysical phenomena which has not been identified. The biennial term of Earth roatation and the corresponding excitation function ψ 3 are also determined from the UT1 series, which enables some conclusions to be drawn about the biennial zonal wind characteristics. Its an effetive method of studying global zonal wind.