中国区域电离层扩展F发生率特征研究

本文利用2011年富克、厦门、南宁、克州、格尔木、西安、北京和漠河等电离层垂测站的电离层扩展F数据,统计了中国区域电离层扩展F发生率的日变化、季节变化和区域变化特征.除了漠河外,中国区域电离层扩展F发生率的日变化、季节变化特征比较一致,扩展F出现在夜间(18～08 LT),且午夜后多于午夜前,以6月为中心的夏季月份扩展F发生率高.电离层扩展F发生率的最大值随着纬度的增加而减少,发生率最大值出现的时间也随着纬度增加而延迟,具有明显的"纬度效应".漠河电离层扩展F与中国区域中其他地方相比较,在发生时间段、发生率数值和季节变化特征方面都具有明显的不同特征,这些情况表明漠河电离层扩展F的产生机制和影响因素可能是不同的.

Characteristics of spread-F occurrence in China region in low solar cycle

The data from Fuke,Xiamen,Nanning,Kezhou,Geermu,Xi’an,Beijing and Mohe ionosondes in 2011 is used in analyzing about the diurnal,seasonal and regional characteristics of spread-F occurrence in China region in low solar cycle.The diurnal,seasonal characteristics of spread-F occurrence in China is consistent basically except Mohe.Spread-F occurs in night(during 18 LT to 08 LT),and spread-F after midnight is more than before midnight.The maximum of spread-F occurrence appears in summer months(centered about June).The maximum of spread-F occurrence decreases with increasing latitude,and the time of spread-F occurrence maximum also delays with increasing latitude.There is an obvious“latitude effect”about spread-F occurrence in China.The difference of spread-F occurrence characteristics between Mohe and other stations(China)in duration,maximum of occurrence and seasonal characteristics,shows that the mechanism and influence factors of spread-F over Mohe maybe are different.