同步卫星讯号显示的电离层闪烁特性

本文利用1983年5—8月,1984年5—12月在武昌(114.4°E,30.6°N)对日本ETS-Ⅱ卫星(130.0°E)发出的136.1124MHz讯号的观测资料进行了统计分析。结果表明:(1)武昌电离层闪烁不但有日变化,而且有季变化。每年5—7月为闪烁最大活动期,在这些月份的夜间常出现法拉弟旋转角类波扰动伴随有强闪烁现象。武昌电离层闪烁是属于中纬闪烁型;(2)闪烁指数与法拉弟旋转角起伏密切相关,它们出现率之间的相关系数为0.8以上;夜间闪烁与扩展F层,白天闪烁与突发E层出现率之间的相关系数分别为0.6和0.55。 

Characteristics of Ionospheric Scintillation of Geostationary Satellite Signals

In this paper, a statistical analysis is made on ionospheric scintillations by processing the data of geostationary satellite beacon measurements and ionograms at Wuchang (114.4°E, 30.6° N) during May-Aug., 1983 and May-Dec., 1984. The results are (1) at Wuchang, ionospheric scintillations exhibit not only diurnal variations but also seasonal variations. In a year, May-July are months of maximum scintillation activity, but nighttime scintillation is closely associated with wavelike perturbation of Faraday rotation. To some extent, it can be said that ionospheric scintillations as observed at Wuchang belong to the type of middle latitude iono-speric scintillation; (2) it is found that there is a close relationship between indices of scintillation and fluctuations of the Faraday rotation, the correlation coefficient between their occurrences is larger than 0.8. Furthemore, it is estimated that both the correlation coefficient between occurrences nighttime scintillation and spread-F and that between occurrences of daytime scintillation and sporadic E are 0.60 and 0.55, respectively.