摘要
利用依巴谷暂定星表（H37）为统一参考架解算出的地极坐标序列和POLE95序列，分析了地极坐标的长期变化、Markowitz变化和其它低频变化。从两个序列得到他极移动长期漂移速度的平均值为3．86mas/yr，方向为西经82°．7；对Markowitz波动的分析表明，其周期约为25～30年，周期和振幅的变化程度分别为10％和40％。
? In order to determine the long term drift, the Markowitz's variation and some other low frequency periods, the polar motion series (H37) determined on the base of the Hipparcos Provisional Catalogue has been analyzed in this paper. For comparison, POLE95, a series of polar motion derived in JPL by using Kalman filtering to the conbined solution of modern space geodesic observations (1976~ 1995), BIHSO (1962. 0~ l982. 0) and ILS (1900~ 1982), has also been analyzed. It is shown in this paper that the average rate of the long term drift in the two polar motion series is about 3. 86mas per year in the direction of 82°.7W, the so - called Markowitz component is also detected carefully, the mean variations of its periods and amp1itudes are estimated to be about l0% and 40% respectively. Some other low frequency variations in the polar motion series are also shown.
出处
《中国科学院上海天文台年刊》
1997年第18期34-40,共7页
Annals Shanghai Astronomical Observatory Chinese Academy of Sciences
