极移十年尺度波动的多分辨率重建及其统计特性

MULTI-RESOLUTION RECONSTRUCTION OF POLAR MOTION AND ITS STATISTICAL CHARACTERISTICS

极移的频谱分布包含ｆ０、ｆ(－１)和ｆ(－２)分量，研究各个分量的统计特征及其产生机制在天文地球动力学的研究中有着十分重要的地位．本文利用小波分析的正交分解的特点，将地球极移按幂律谱进行分解，提出了核函数的概念，并对校函数的特性进行了分析．结果表明：ｆ(－１)过程的核函数的平均变化周期４３８天，最大变化周期５２５天，最小３４５天，ｆ(－２)过程的核函数的平均变化周期４２６天，最大变化周期４９５天，最小３６０天．ｆ０过程与太阳黑子的变化有很强的相关性，ｆ(－１)和ｆ(－２)分量与太阳活动无关．

The polar motion spectum contiones frequency compoment of f0, f-1 and f-2.Both the statistical characteristics of each compoment and its generation mechanismare playing a great role in the astronomy and geodynamics. In this paper, polarmotion of the earth is power spectrum model analyzed according to the wavelet theory.The core function is put forward for the first time, and the characteristics of corefunction is analyzed also. For the core function, the results shows that the meanvariation period of f-1 process is 438 days with 525 days for max. and 345 daysfor min., and that mean variation period of f-2' process is 426 days with 495days for max and 360 days for min. The f0 process is correlative with the change ofsunspot numbers and the f-1 process and f-2 process is independent of sunspotnumbers.