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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Dynamics of energetic electrons in nonstationary quasi-perpendicular shocks
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Dynamics of energetic electrons in nonstationary quasi-perpendicular shocks

机译：动力学不稳定的高能电子quasi-perpendicular冲击

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摘要

A one-dimensional full particle-in-cell (PIC) code is utilized to investigate energetic electron bursts produced at a nonstationary quasi-perpendicular shock. A number of electrons are intermittently energized by interacting with nonstationary electromagnetic fields in the shock front. Some of the energetic electrons are reflected at the shock and form an upstream non-thermal population. The reflection process is strongly affected by the non-coplanar magnetic field component which is temporarily rather strong in the transition region of a highly nonstationary shock. Oblique whistler waves in the transition region influence the distribution function of the reflected electrons. Waves excited by the modified two-stream instability may pitch angle scatter the electrons and thus blur the loss cone feature of the reflected electrons. Dispersive standing whistler waves are also emitted locally in the foot even when a Mach number exceeds a critical value. These whistler waves may also scatter the electrons to blur the loss cone. Furthermore, the whistler waves produce clumps of the reflected electrons in a phase space. Some electrons are trapped by the ion holes produced downstream as a remnant of a self-reformation process of the shock front and accelerated through a drift mechanism. It is also discussed how physical quantities associated with the reflected electrons observed upstream of the shock can give information about the shock front nonstationarity as well as about local small scale wave activities in the transition region.
机译：一维全particle-in-cell (PIC)的代码利用调查高能电子吗爆发产生的非平稳quasi-perpendicular冲击。间歇性地激励的相互作用非稳定的电磁场的冲击前面。反映在冲击,形成一个上游非热能的人口。强烈non-coplanar磁性的影响暂时,而字段组件在一个高度的过渡区非平稳的冲击。过渡区影响分布函数反映的电子。修改二束兴奋的不稳定螺旋角散射电子,因此吗模糊的损失锥特征反映了电子。还发出本地的脚即使马赫数量超过一个临界值。波也会散射电子模糊损失锥。生产反映电子的团相空间。产生离子洞下游的遗迹self-reformation激震前沿和的过程加速通过一个漂移机制。讨论了如何相关的物理量观察到上游的反射电子冲击能给激震前沿的信息非平稳以及对当地小在过渡区域尺度波活动。

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