A stochastic excitation model for the study of the Chandler wobble

被引：0

作者：

Huang, SY ^{[1
]}

Liao, XH

Zhu, YL

机构：

[1] Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China

[2] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

来源：

CHINESE ASTRONOMY AND ASTROPHYSICS | 2002年 / 26卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Chandler wobble; stochastic excitation; effective atmospheric angular momentum;

D O I：

10.1016/S0275-1062(02)00042-5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Based on the hypothesis that the Chandler wobble is excited by stochastic motions, a nonlinear, stochastic model is proposed consisting of a random Heaviside step function and an Eulerian centred differential scheme for a linear oscillator with drag. The model is studied both analytically and numerically. From a statistical analysis of the time series of effective atmospheric angular momentum it is shown that the stochastic component can excite 28-40% of the amplitude of the Chandler wobble. Finally the hypothesis of stochastic excitation is discussed.

引用

页码：49 / 56

页数：8

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