...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Origin of backstreaming electrons within the quasi-perpendicular foreshock region: Two-dimensional self-consistent PIC simulation
【24h】

Origin of backstreaming electrons within the quasi-perpendicular foreshock region: Two-dimensional self-consistent PIC simulation

机译：内回流电子的起源quasi-perpendicular前震地区:二维自洽PIC模拟

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The foreshock region is populated by energetic backstreaming particles (electrons and ions) issued from the shock after having interacted with it. Several aspects concerning the origin of these high-energy particles and their corresponding acceleration mechanisms are still unresolved. The present study is focused on a quasi-perpendicular curved shock and associated electron foreshock region (i.e., for 90° ≥θ_(Bn) ≥ 45°, where θ_(Bn) is the angle between the shock normal and the upstream magnetostatic field). Two-dimensional full-particle simulation is used in order to include self-consistently the electron and ion dynamics, the full dynamics of the shock, the curvature effects and the time-of-flight effects. All expected salient features of the bow shock are recovered both for particles and for electromagnetic fields. Present simulations evidence that the fast-Fermi acceleration (magnetic mirror) mechanism, which is commonly accepted, is certainly not the unique process responsible for the formation of energetic backstreaming electrons. Other mechanisms also contribute. More precisely, three different classes of backstreaming electrons are identified according to their individual penetration depth within the shock front: (i) "magnetic mirrored" electrons which only suffer a specular reflection at the front, (ii) "trapped" electrons which succeed to penetrate the overshoot region and suffer a local trapping within the parallel electrostatic potential at the overshoot, and (iii) "leaked" electrons which penetrate even much deeper into the downstream region. "Trapped" and "leaked" electrons succeed to find appropriate conditions to escape from the shock and to be reinjected back upstream. All these different types of electrons contribute together to the formation of energetic field-aligned beam. The acceleration mechanisms associated to each electron class and/or escape conditions are analyzed and discussed.
机译：前震地区居住着精力充沛逆流粒子(电子和离子)从冲击相互作用后发出用它。这些高能粒子和它们相应的加速机制仍在没有解决。quasi-perpendicular弯曲冲击和关联电子前震地区(例如,90°≥θ_ (Bn)≥45°,θ_ (Bn)之间的角度冲击正常和上游静磁字段)。为了包括自我一贯地使用电子和离子动力学、动力学的冲击,和曲率的影响飞行时间的影响。弓形激波都恢复的特性粒子和电磁场。模拟fast-Fermi的证据加速度(磁镜)机制,是普遍接受的,当然不是唯一的吗负责的形成过程精力充沛的回流电子。机制也贡献。不同的回流电子类根据他们的个人识别内的穿透深度激震前沿:(我)只有遭受“磁镜像”电子镜面反射在前面,(2)电子成功渗透过度地区遭受当地捕获在平行静电势过头,(3)下游渗透甚至更深地区。找到合适的条件来逃避冲击和注入的上游。这些不同类型的电子贡献精力充沛的形成field-aligned光束。关联到每个电子类和/或逃跑条件进行了分析和讨论。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号