【摘要】 为了研究脉冲星辐射机制中的非线性动力学特性,计算了毫秒脉冲星J0437-4715单个脉冲辐射强度时间序列的饱和关联维数、Kolmogorov熵和Lya-punov指数,统计了104个单个脉冲辐射强度时间序列的混沌特征参数的分布。研究结果表明,毫秒脉冲星J0437-4715单个脉冲辐射过程存在混沌特性,描述这种复杂的非线性辐射机制至少需要5~6个独立变量,采用混沌预测方法对单个脉冲辐射强度进行预测的时间尺度理论值分布在以1.67ms为中心的窄带内。更多还原

【Abstract】 The chaotic characteristic parameters,including the saturated correlative dimensions,Kolmogorov entropy and the largest Lyapunov exponent,were computed for the radiation process of individual pulse from millisecond pulsar J0437-4715.Based on the statistic datum of 104 individual pulses,the chaotic characteristic parameters distribution was introduced.The results show that chaos exist in the radiation process of individual pulses from PSR J0437-4715,5~6 independent variables are needed to represent the complex non-linear radiation mechanism,and the time scales of forecasting the radiation intensity are limited to the narrow band which center is about 1.67ms.更多还原