微粒E层事件判读及分析  

Ionogram scaling related to particle E event and its analysis

作　　者：何绍红[1] 徐彤[1] He, Shaohong[1]; Xu, Tong[1]

机构地区：[1]中国电波传播研究所电波环境特性及模化技术重点实验室,山东青岛266107

出　　处：《电波科学学报》2013年第1期154-159,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金(No.41004066;No.41004065;No.41104108);国家国际科技合作专项资助(No.2011DFA22270)

摘　　要：2012年2月16日我国14个电离层观测站观测到微粒E层事件.针对目前微粒E层事件判据及相应电离图判读方法不统一问题,借助该事件对微粒E层判据进行了讨论,在已有资料基础上,结合自身多年度量经验,形成六条判据,并通过电离图实例,说明度量方法.希望藉此形成典型微粒E层判读方法,为电离图度量及科研人员提供参考.同时,利用我国14个电离层观测站电离图,对该次事件进行初步分析.结果表明:纬度较高的观测站(如满洲里、乌鲁木齐、北京)F层非常波低频端时延增加显著,但没有出现E层回波,即有事件无类型;中纬度台站(如兰州、重庆、拉萨等)夜间E层回波清晰、可辨,且持续时间较长;较低纬度台站(昆明、海口及广州)夜间E层回波较弱,持续时间短.此外,通过对地磁活动数据及电离层foF2分析,发现该次事件发生在磁暴主相期间,与磁层活动相关,同时对微粒E层成因进行了讨论.At the present time, the criterions and scaling method of particle E are inconsistent. A distinct particle E event occurred on 16 February 2012, observed by 14 ionosondes in China, with which the criterions were discussed and six criterions were developed with some references and experiences. Simultaneously, based on the several ionograms, the scaling method was presented. By using the ionograms registered by the 14 ionosondes, the particle E event was analyzed, and the results showed that the time-delay of low frequency of extra-ordinary wave was notable at higher latitude stations （such as Manzhouli, Urumqi, Beijing）, particle E was dis- cernable with long life-time at middle latitude stations （such as Lanzhou, Chongqing, Lhasa, etc. ）, and was weaker with short life time at lower latitude stations （such as Haikou, Guangzhou）. Furthermore, by analyzing geomagnetic indices and ionospheric critical frequency foF2, we found that the occurrence of this particle E event occurred in the main phase of the geomagnetic storm. Finally, the mechanism of particle E event was discussed.

关 键 词：微粒E层 电离图度量 磁暴 粒子沉降 

分 类 号：P352.7[天文地球—空间物理学]