海南地区电离层闪烁监测及初步统计分析

Ionospheric Scintillation Monitoring and Preliminary Statistic Analysis Over Hainan Region

为开展赤道区的电离层闪烁形态特性及相关物理过程的研究，空间中心海南台站建立了一套 GPS电离层闪烁监测系统．该系统是利用 Plessey GPS Builder-2 系统开发的，对软件的源码进行了修改，使其能以高采样率(50/s)同时并行记录11个通道 GPS 信号强度数据．对2003年7—12月间 L-波段电离层闪烁事件的初步统计分析结果表明，电离层闪烁主要发生在日落后到午夜附近，其中9—11月较7—8月闪烁发生和结束的时间明显提前；电离层闪烁发生的频率和强度在9—11月较其他月份明显增强，其中10月达到最大；电离层闪烁的逐日变化具有很强的随机性，闪烁的发生在秋分附近9月底到10月中旬的磁静日期间达到最大；太阳和地磁活动的增强通常会抑制电离层闪烁的发生，这种情形在秋分附近尤为明显．

To investigate the equatorial ionospheric scintillation morphology and the relevant phys-ical processes,one GPS ionospheric scintillation monitor was installed at CSSAR Hainan station.The monitor is built on Plessey GPS Builder-2 development system with its software modified tolog signal strength from up to 11 channels at a high data rate(50 samples/s).It is suits the hightime resolution studies of scintillation spectral and temporal characteristics and also can be usedto perform the statistic analysis of scintillation signals.The preliminary analysis results of L-bandionospheric scintillations during Jul.—Dec.2003 show that ionospheric scintillations mainly occurnear from sunset to midnight,where the onset and end time are evidently more advanced in Nov.—Dec.than in Jul.—Aug.;the occurrence rate and intensity of ionospheric scintillations are evidentlymore enhanced in Sept.—Nov.than in other months,and reach their peaks in Oct.;there is thestrong randomness for the day-to-day variability of ionospheric scintillations,and the scintillationoccurrence reaches their peak during the magnetic quiet days from the end of Sept.to the middleof Oct.near autumnal equinox;the increase of solar and geomagnetic activities generally may limitthe occurrence of ionospheric scintillations,especially near autumnal equinox.