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地球变化磁场Z分量的混沌动力学特性分析 被引量:9

Chaotic dynamic characteristics of Z component in geomagnetic variation field
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摘要 对地球变化磁场进行了混沌动力学特性分析,主要进行了以下两个方面的工作:1)运用多种方法对多个地磁台站同一时段变化磁场分量数据(分为磁扰较小和磁扰较大时段)进行了混沌特性分析,主要是为了以更充分的判据来验证地球变化磁场是否具有混沌特性;2)同一地磁台站不同时段变化磁场分量数据的混沌特性分析,主要是验证地球变化磁场是否具有变参数混沌特性.分析结果表明:1)变化磁场时间序列确实具有混沌特性;2)从混沌时间序列相空间重构的角度可初步认为模拟地球变化磁场动力学系统所必须的独立变量应该为6左右;3)变化磁场时间序列不仅具有混沌特性而且其参数也是在缓慢变化着的,具有变参数混沌系统的特性. The article analyzes the chaotic dynamic characteristic of geomagnetic variation field mainly in two aspects:(1) analyzing the chaotic dynamic characteristic of the geomagnetic variation field data observed at the same period (both low geomagnetic disturbance period and high geomagnetic disturbance period) from a series of geomagnetic stations using multiple approaches,in order to get a sufficient proof to validate whether there is chaotic dynamic characteristic in geomagnetic variation field; (2) analyzing the chaotic dynamic characteristic of the geomagnetic variation field data observed at different periods from the same geomagnetic station,aiming at finding out whether there is a parameter-varying chaotic characteristic in the geomagnetic variation field. The results indicate:(1) There is definitely chaotic dynamic characteristic in the geomagnetic variation field time series. (2) In view of chaotic time series phase space reconstruction,the number of independent variables to simulate the geomagnetic variation field dynamical system is about 6. (3 ) Geomagnetic variation field time series shows not only chaotic dynamic characteristic but also parameter-varying dynamical chaotic characteristic.
出处 《物理学报》 SCIE EI CAS CSCD 北大核心 2010年第5期3077-3087,共11页 Acta Physica Sinica
基金 国家自然科学基金(批准号:60705001和40974037) 中国博士后科学基金(批准号:20080430234)资助的课题~~
关键词 地球变化磁场 混沌 变参数系统 LYAPUNOV指数 geomagnetic variation field chaos parameter-varying dynamical system Lyapunov exponents
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