利用CHAMP卫星掩星数据分析偶发E层现象

Analyzing sporadic E phenomena from CHAMP satellite occultation data

利用滑动平均滤波等系列数据处理方法,对2004年CHAMP卫星的GPS掩星观测数据进行详细分析,得到Es随地理纬度和高度的月平均变化特征。结果表明：北半球和南半球夏季Es扰动剧烈;5月北半球中纬地区出现了比较特殊的Es强烈扰动;在南、北纬15°~45°和高度90~110 km经常出现Es强扰动。从分析结果可以看出,Es的分布规律与太阳活动密切相关。

Using moving average filter and other data processing methods,the GPS occultation observations data were analysized by the CHAMP satellite in 2004,a monthly retrieval of global sporadic E（Es） morphology in terms of geographical latitude and altitude variations has been done in this paper.The statistical results show that Es disturbances are severe in summer in the Northern and Southern Hemisphere.Moreover,it is found that strong Es disturbances take place in mid-latitude regions of the Northern Hemisphere in May especially.The present study also shows that strong Es disturbances often take place in the altitude range of 90 to 110 km and within the 15° to 45° N and 15° to 45° S regions.It＇s evident that the distribution of Es is closely related to the solar activity.