太阳高年期间海南电离层扩展F出现的起始时间研究

Research of Starting Time of Ionospheric Spread-F Observed in Hainan during High Solar Activity

电离层扩展F与电离层闪烁现象密切相关,它们出现的起始时间存在着很大程度上的一致性,因此研究电离层扩展F出现的起始时间将对闪烁预报模型的建立具有重要的应用价值。将太阳高年(2002年3月—2003年2月)期间海南地区DPS-4测高仪观测到的扩展F按照频率、区域、混合和强区域扩展等分为四种类型,对其出现的起始时间进行了分析研究。结果表明:频率扩展和混合扩展的起始时间分别集中在0200LT—0800LT和0000LT—0600LT;而区域扩展和强区域扩展出现的起始时间分别集中在2000LT—0200LT和2000LT—2200LT。

The ionospheric Spread-F （SF） and scintillations have the strong affinity, and the distribution of their starting time has an uniform to a great extent, so there＇ s an important applied value of research on SF starting time in order to build scintillation forecasting model. Using the SF data observed by the DPS-4 digisonde at Hainan ionospheric observatory station between March 2002 and February 2003, the properties of starting time of four type SF, i. e. , frequency, range, hybrid, and strong SF, are statistically studied. The results show that the starting time of most of the frequency SF and the hybrid SF was between 0200LT -0800LT and 0000LT -0600LT, respectively. The starting time of the range SF and the strong SF mainly happened between 2000LT-0200LT and 2000LT-2200LT, respectively.