地球磁层极尖区场向电子事件期间能量特性研究

史建魁; 张子迎; TORKAR Klaus; 王铮; 程征伟; 王国军

doi:10.11728/cjss2016.06.849

地球磁层极尖区场向电子事件期间能量特性研究

doi: 10.11728/cjss2016.06.849 cstr: 32142.14.cjss2016.06.849

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

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

详细信息

通讯作者:

史建魁,E-mail:E-mail:jkshi@nssc.ac.cn

中图分类号: P353.2
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出版历程
- 收稿日期: 2016-03-04
- 修回日期: 2016-05-10
- 刊出日期: 2016-11-15

Study on Energy Features During a Field-Aligned Electron Events in the Cusp Region

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

摘要

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.
- 极尖区 /
- 场向电子 /
- 能量特性 /
- 电离层起源
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.
- Polar cusp /
- Field-aligned electrons /
- Energy feature /
- Original from ionosphere

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参考文献(24)

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