摘要
本文使用Athens站2001—2005年间电离层GPS/TEC和foF2数据,分析了TEC、NmF2和电离层板厚τ日变化、季节变化特征以及与太阳活动的统计关系,得到以下结论:电离层TEC和NmF2具有相似的日变化特征,最大值出现在14∶00LT;TEC在2001和2002年白天出现"冬季异常"现象,NmF2在2001—2005年白天均出现该现象;电离层板厚τ主要分布在200～600km,存在黎明峰和日落峰双峰结构,黎明峰一般出现在5∶00—6∶00LT,日落峰结构一般从日落后开始出现,在午夜前达到极大值;14∶00LT和2∶00LT时刻TEC、NmF2同太阳活动的关系呈现"线性"、"饱和"以及"放大"趋势,而τ则出现正、负及不明显的线性关系;最后,我们分析认为黎明峰归因于电离层TEC增加以及NmF2的减少,而日落峰主要是由TEC减少速度低于NmF2造成的.
The data of TEC, foF2 obtained at the Athens station, from year 2001 to 2005, are used to analyze the diurnal, seasonal, and solar activity variations of TEC, NmF2 and slab thickness r. The results reveal that TEC and NmF2 have similar diurnal variation patterns, and maximize at 14 ＂00LT. The ＂winter anomalies＂ of TEC occurred during daytime in year 2001 and 2002, while that of N^F2 occurred between 2001 and 2005. The r values are about 200~600 kin, and show double-peak structures including predawn and sunset peaks. The predawn peak appeared usually at 5 ＂00--6 ＂00LT, and the sunset peak began to appear after sunset, reaching the maximum value before midnight. The relationships between ionospheric TEC, N^F2 and solar activity show linear, saturation and amplification features, while r had positive and negative linear variations or an unremarkable linear relationship. Finally, we suggest that the predawn peak is caused by the increased TEC and decreased NmF2, and the sunset peak can be attributed to the slower decrease for TEC than NmF2.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第11期3558-3567,共10页
Chinese Journal of Geophysics
基金
国家自然科学基金项目(40890162
40505005)
解放军理工大学气象学院预研基金项目资助
