武昌哨声的传播特征及其与地磁活动的相关

本文利用武昌(磁纬19.2°N)连续三年的哨声观测资料,研究了武昌地区哨声传播的一般特征。着重对武昌哨声的传播路径进行了分析推断,并讨论了它们与地磁活动的相关特性。发现:武昌哨声的显著特征是色散与电离层f₀F₂有明显的正相关关系;其次常出现一类色散值稳定、出现率也很高的哨声。此外,对典型事件的分析及统计分析都表明武昌哨声出现率在地磁扰动时明显增高;哨声色散在磁暴急始后不久即有一个急剧的上升,上升幅度达18%至37%。 

CHARACTERISTICS OF WHISTLER PROPAGATION AT WUCHANG AND THEIR CORRELATION WITH GEOMAGNETIC ACTIVITY

In this paper,the general characteristics of low-latitude whistler propagation is investigated by analysing the data obtained at Wuchang (geom.lat.19.2°N) for last three years.Attention is paid to the study of whistler propagation paths.Besides,a closed examination is made of the correlation between the whistler parameters at Wuchang and ionospheric electron concentration,as well as the geomagnetic activity.A good correlation has been found between whistler dispersion and f₀F₂.It is also shown that there exists a type of whistler with stationary dispersion values,the occurrence rate of which is much higher than other types.This is one of the remarkable features of whistlers at Wuchang,showing that in the low-latitude ionosphere region there possibly exist stationary and recurrent whistler propagation paths.In addition,analysis of typical events and statistical calculation both show that the occurrence rate of whistlers increases considerably during magnetic storms.The dispersion value slightly increases following the SSC of the storms,the amplitude of the increase being 118-137% of the monthly mean value.