地球磁层极尖区场向电子事件期间能量特性研究 |
| |
引用本文: | 史建魁,张子迎,TORKAR Klaus,王铮,程征伟,王国军.地球磁层极尖区场向电子事件期间能量特性研究[J].空间科学学报,2016,36(6):849-856. |
| |
作者姓名: | 史建魁 张子迎 TORKAR Klaus 王铮 程征伟 王国军 |
| |
作者单位: | 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; |
| |
基金项目: | 国家自然科学基金项目(41274146,41474137,41574150)和国家重点实验室专项基金项目共同资助 |
| |
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5~200eV和500~1500eV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.
|
关 键 词: | 极尖区 场向电子 能量特性 电离层起源 |
收稿时间: | 2016-03-04 |
Study on Energy Features During a Field-Aligned Electron Events in the Cusp Region |
| |
Institution: | 1. State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190;2. University of Chinese Academy of Sciences, Beijing 100049;3. College of Applied Arts and Science, Beijing Union University, Beijing 100191;4. Space Research Institute, Austrian Academy of Sciences, Graz, Austria, A-8042 |
| |
Abstract: | 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 down-flowing, 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. |
| |
Keywords: | |
本文献已被 CNKI 等数据库收录! |
| 点击此处可从《空间科学学报》浏览原始摘要信息 |
| 点击此处可从《空间科学学报》下载免费的PDF全文 |
|