文献类型：期刊文献

英文题名：Distribution of Field-Aligned Electron Events in the High-Altitude Polar Region: Cluster Observations

作者：Shi, Jiankui[1,2,3];Zhang, Ziying[4];Torkar, Klaus[5];Cheng, Zhengwei[1];Farzakeley, Andrew[6];Dunlop, Malcolm[7];Carr, Chris[8]

第一作者：Shi, Jiankui

通讯作者：Zhang, ZY[1]

机构：[1]Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China;[2]Univ Chinese Acad Sci, Sch Astron, Beijing, Peoples R China;[3]Univ Chinese Acad Sci, Sch Space Sci, Beijing, Peoples R China;[4]Beijing Union Univ, Coll Appl Arts & Sci, Beijing, Peoples R China;[5]Austrian Acad Sci, Space Res Inst, Graz, Austria;[6]UCL, Mullard Space Sci Lab, London, England;[7]Rutherford Appleton Lab, Space Sci & Technol Dept, Didcot, Oxon, England;[8]Imperial Coll London, Blackett Lab, London, England

第一机构：Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China

通讯机构：[1]corresponding author), Beijing Union Univ, Coll Appl Arts & Sci, Beijing, Peoples R China.|[114172]北京联合大学应用文理学院;[11417]北京联合大学;

年份：2017

卷号：122

期号：11

起止页码：11245-11255

外文期刊名：JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS

收录：;Scopus(收录号：2-s2.0-85033795977);WOS:【SCI-EXPANDED(收录号:WOS:000419938600021)】；

基金：This work was supported by the National Natural Science Foundation of China (41474137, 41674145, and 41374169) and the Specialized Research Fund for State Key Laboratory in China. We thank the PEACE and FGM instrument teams providing the data and data product in the Cluster Science Archive (www.cosmos.esa.int/web/csa).

语种：英文

外文关键词：cluster observation; field-aligned electrons; high altitude; polar region; spatial distribution

摘要：Field-aligned electrons (FAEs) are important for the energy transport in the solar wind-magnetosphere-ionosphere coupling. However, the distribution of FAEs and the concerning physical mechanism in different altitudes of the polar region are still unclear. In this paper, data from the Cluster spacecraft were used to study the characteristics of FAEs in high-altitude polar region. We selected FAE events with a flux higher than 3 x 10(8)(cm(2) s)(-1) for our analysis. Their distribution was double peaked around the auroral oval. The main peak occurred around the cusp region (magnetic local time (MLT) 0700-1500) which leaned to the dawnside. The other peak appeared in the evening sector with MLT 2100-2300 just before midnight. The durations of the FAE events covered a wide range from 4 to 475 s, with most of the FAE events lasting less than 40 s. The possible physical mechanisms are discussed, namely, that the downward FAEs may consist of decelerated solar wind and reflected up flowing ionospheric electrons in the potential drops, whereas the upward ones may be mirrored solar wind electrons and accelerated ionospheric up flowing electrons.