中国低纬地区foF2实测数据缺失的分布特征研究  

A statistical analysis of occurrence characteristics of missed-foF2 observations over low-latitude region of China

作　　者：万德焕 黄江[2] 徐杰[2] 邓柏昌[3] 孔德宝[3] 胡猛[2] 全宏俊[3] 

机构地区：[1]华南理工大学电子与信息学院,广州510641 [2]广州气象卫星地面站,广州510643 [3]华南理工大学物理与光电学院,广州510641

出　　处：《地球物理学进展》2015年第5期2071-2081,共11页Progress in Geophysics

基　　金：广东省科技计划项目(2013B020200010)资助

摘　　要：利用美国NOAA和澳大利亚IPS提供的foF2实测数据,研究中国低纬地区foF2数据缺失的分布特征以及产生缺失的相关原因.结果表明:(1)foF2缺失是一个夜间现象,白天的缺失远比晚上少,并且在夏季的6或7月份的缺失最多、春秋季月份缺失较多、冬季月份则较少;(2)从一个太阳周期变化上看,foF2的缺失与太阳黑子数有着相反的变化规律,即太阳黑子数越高foF2的数据缺失越少,反之则越高.(3)foF2晚上时段的缺失在午夜前和午夜后的分布有明显不同,表现为夏季时段,午夜后的缺失占据主导;而在春秋季节,则表现为午夜前的缺失占据主导.通过分析研究,我们得到的结论是晚间foF2缺失的直接原因是扩展F层的出现所造成,并且不同类型的扩展F层造成的缺失分布也会不一样.统计表明,晚间foF2缺失与扩展F层的相关系数高达0.93.本文第一次从数据缺失上,对中国低纬地区foF2实测数据进行研究,得到比较完整的缺失分布特征,并给出了产生缺失的原因,可能对以后的研究有一定的参考意义.By using the observed data of foF2 from NOAA and IPS,we find that the distribution of missed-foF2 observations over China sector as follows：（1）the missed-foF2 observations is a nighttime phenomenon.The occurrence of missed-foF2 observations at night far outweighed those during daytime,especially in the equinoctial and summer months.（2）The occurrence of missed-foF2 observations has an inverse relationship with solar activity.During quiet solar activity periods, there is more the occurrence of missed-foF2 observations than at other times,especially in the summer months.As solar activity enhance,the occurrence of missedfoF2 observations will reduce.When the solar activity reached the maximum in a solar cycle,it would be the minimum occurrence of missed-foF2 observations.（3）The distribution of missed-foF2 observations between pre-midnight and postmidnight are also different.Results show that during summer months,the percentage of missed-foF2 observations in the premidnight hours is higher;but during equinoctial months,the percentage of missed-foF2 observations in the post-midnight hours is higher than pre-midnight.The occurrence of missedfoF2 observations at night is strongly correlated with the occurrence of spread-F.The correlation between them is as high as 0.93.The plausible cause could be the occurrence of spread-F which in turn is responsible for the generation of the occurrence of missed-foF2 observations during the night.

关 键 词：FOF2 foF2缺失 扩展F层(SF) 

分 类 号：P352[天文地球—空间物理学]