极移速度的周期分析  

PERIODIC ANALYSIS OF VELOCITY OF POLAR MOTION

作　　者：钱昌夏 

出　　处：《中国科学院上海天文台年刊》1995年第16期35-40,共6页Annals Shanghai Astronomical Observatory Chinese Academy of Sciences

摘　　要：本文对瞬时极的移动速度用自回归谱估计的Marple算法进行了周期分析，结果表明，瞬时极的移动速度可能存在着2386．天（6．5年）、1168．9天（3．2年）、321．3天、163．7天、130．1天及92，7天等6个周期。同时计算了极移的振幅和周期，发现极移的速度与极移的振幅正相关，与极移的周期负相关。并且发现厄尔尼诺现象都出现在地极移动周期较短的年份。In this paper, the periods of velocity of polar motion are ana1ysed in using the meth0d ofMarple estimate. As a result, the periodic terms of 2386. S days, 1168. 9 days, 32l. 3 days,l63. 7 days, 13O. 1 days and 92. 7 days have been derived. By caloulating the amp1itude andthe period of polar motion, it is found that there is a positive correlation between the ve1ocityand the amplitude of polar motion, but a negative correlation between the velocity and theperiod of polar motion. It is also found that El N1fio is always happened in the year when theperiod of polar motion is short.

关 键 词：极移 频谱分析 周期 瞬时极 厄尔尼诺事件 自回归谱分析 

分 类 号：P127.4[天文地球—天体测量]