我国中部地区电离层扰动时空尺度的统计分析

将最大熵动态互普方法用于高频多普勒台阵数据处理，从覆盖太阳活动高、低年份的高频多普勒台阵观测数据中，得出了中国中部地区电离层声重波扰动的传播方向、时空尺度等参量之间的统计分布特性，进而探讨了有关扰动源的情况，结果表明，极区源和局地源两种不同的激发源所激发的声波，分别反映了电离层扰动的全球传播和地区特性两种不同的特征。

A STATISTICAL STUDY FOR THE SPACIAL-TEMPORAL SCALE OF IONOSPHERIC DISTURBANCES IN MIDDLE CHINA

In this paper the dynamic cross spectral analysis with maximum entropy method is used to yield the spacial-temporal scale and the propagation direction of the ionospheric disturbances from the data of a Doppler array.The obtained parameters of the disturbances are statistically studied,and the results reveal two types of ionospheric disturbances:one is the southward propagated wave which has the large scale on both spacial and temporal domain,the other is the north-eastward wave which has the relatively smaller scale.The sources of the southward waves are related to the polar activeties,and those of the northeastward waves may be located in the easten Qinhai-Tibet Plateau with abruptly swollen topography.The paper concluded that the global and the local properties of the ionospheric disturbances have some thing to do with the polar source and the local source respectively.