基于GPS-TEC方法的日偏食期间电离层效应研究

Ionosphere Effects of Partial Solar Eclipses Based on GPS-TEC Method

基于国际GNSS服务(International GNSS Service,IGS)WUHN、BJFS站GPS观测数据,利用码与相位观测值联合解算北京时间2010-01-15、2012-05-21日偏食前后电离层总电子含量(total electronic content,TEC),以此探测两次日偏食过程中的电离层效应。研究分析表明,日偏食期间电离层效应微弱,电离层TEC存在异常扰动,异常过程为先减少、达到最大变化量、逐步恢复正常,该过程与测站日偏食过程具有时间一致性,电离层TEC最大变化量不足1TECU,最大变化时刻滞后食甚时刻1~13min,不存在电离层TEC长时间异常现象。

Based on GPS observation data from WUHN and BJFS stations of International GNSS Service（IGS）,this paper works out ionosphere TEC（total electronic content）value during partial solar eclipses that occurred on Jan.15,2010 and May 21,2012 Beijing time by means of pseudorange and phase measurements in order to detect ionosphere abnormity caused by partial solar eclipses.Analysis result shows that there is weak ionosphere effect and TEC disturbance during partial solar eclipses.Ionosphere TEC decreases firstly,then reaches the maximum variation,and returns to normal value gradually.The process is consistent with the change of the partial solar eclipse at this station.The maximum variation is less than 1TECU,which lags 1to 13 minutes behind the time of the middle eclipse.The long-term ionosphere abnormity doesn＇t exist.