海南地区电离层闪烁监测及初步统计分析

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.

Ionospheric Scintillation Monitoring and Preliminary Statistic Analysis Over Hainan Region

To investigate the equatorial ionospheric scintillation morphology and the relevant physical 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 to log signal strength from up to 11 channels at a high data rate(50 samples/s).It is suits the high time resolution studies of scintillation spectral and temporal characteristics and also can be used to perform the statistic analysis of scintillation signals.The preliminary analysis results of L-band ionospheric scintillations during Jul.-Dec.2003 show that ionospheric scintillations mainly occur near 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 evidently more enhanced in Sept.-Nov.than in other months,and reach their peaks in Oct.;there is the strong randomness for the day-to-day variability of ionospheric scintillations,and the scintillation occurrence reaches their peak during the magnetic quiet days from the end of Sept.to the middle of Oct.near autumnal equinox;the increase of solar and geomagnetic activities generally may limit the occurrence of ionospheric scintillations,especially near autumnal equinox.