行星际空间系统的低维迹象

INDICATION OF LOW DIMENSIONALITY IN INTERPLANETARY SPACE SYSTEM

利用１９７５年７月至１９７６年７月、１９８５年和１９８７年由行星际闪烁（ＩＰＳ）测量得到的太阳风速度资料，应用非线性动力学技术重构了这些时间序列在相空间的吸引子，求得吸引子的分维数３＜Ｄ＜４，最大Ｌｖａｐｕｎｏｖ指数总为正值．这些结果初步表明，行星际空间可能是一个低维的混沌系统．

Using the data of the solar wind speed from IPS measurements in July,1975-July,1976,1985 and 1987,the attactor for the time series was reconstructed by using nonlinear dynamical techniques and its fractal dimension with 3<D<4 was obtained. The largest Lyapunov exponent is always positive. The results show preliminarily that the interplanetary space may be a low-dimensional chaotic system.