文献类型：期刊文献

中文题名：地球磁层极尖区场向电子事件期间能量特性研究

英文题名：Study on Energy Features during a Field-aligned Electron Events in the Cusp Region

作者：史建魁[1,2];张子迎[3];TORKAR Klaus[4];王铮[1];程征伟[1];王国军[1]

第一作者：史建魁

机构：[1]中国科学院国家空间科学中心空间天气学国家重点实验室,北京100190;[2]中国科学院大学,北京100049;[3]北京联合大学应用文理学院,北京100191;[4]Space Research Institute,Austrian Academy of Sciences,Graz,Austria,A-8042

第一机构：中国科学院国家空间科学中心空间天气学国家重点实验室,北京100190

年份：2016

卷号：0

期号：6

起止页码：849-856

中文期刊名：空间科学学报

外文期刊名：Chinese Journal of Space Science

收录：CSTPCD;;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

基金：国家自然科学基金项目(41274146,41474137,41574150);国家重点实验室专项基金项目共同资助

语种：中文

中文关键词：极尖区;场向电子;能量特性;电离层起源

外文关键词：Polar cusp; Field-aligned electrons; Energy feature; Original from ionosphere

摘要：根据Cluster卫星2001年9月30日在北半球极尖区观测到的一次强扰动场向电子事件数据,分析研究了这次事件期间场向电子的能量特性,讨论了场向电子对太阳风能量向磁层的传输和磁层-电离层耦合过程中能量传输的作用.分析认为,这次电子扰动事件期间电子速度和密度都具有很强的扰动变化,电子速度增加是一个主要特点.本次事件中低能段5~200 eV和500~1500 eV内的能谱分析结果表明,上行电子通量大于下行电子通量,上行电子主要来源于电离层,说明电离层上行电子在本次事件中具有非常活跃的作用.根据电离层中带电粒子的能量特征分析结果可知,这次事件中电离层起源的上行电子在上行过程中得到了加速.关于加速机制问题还有待深入研究.
By focusing on an extremely disturbed field-aligned electrons event observed with Cluster in the northern cusp region on 30 September 2001,the energy features of the field-aligned electrons in the event is analyzed and the roles of the field-aligned electrons on the transmission of solar wind energy to the magnetosphere and on the magnetosphere-ionosphere coupling are discussed.The results show that the velocities and densities of the electrons have strong disturbances during the event,and the velocity is a main factor to enhance the electron flux.The electron energy spectrum in 5~200eV and 500~1500eV show that the up-flowing electron flux is higher than that of downflowing,which means the up-flowing electrons mainly come from the ionosphere and play an active role in this event.The energy features show that the ionospheric electrons have been accelerated during the up-flowing.However,the accelerating physical mechanism still needs to be further studied.