Relativistic, perpendicular shocks in electron-positron plasmas
Relativistic, perpendicular shocks in electron-positron plasmas
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DOI：
10.1086/171326
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发表时间：
1992-05
期刊：
影响因子：
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通讯作者：
Y. Gallant;M. Hoshino;A. Langdon;J. Arons;C. Max
中科院分区：
文献类型：
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作者：
Y. Gallant;M. Hoshino;A. Langdon;J. Arons;C. Max
一维细胞内粒子等离子体模拟用于检查电子-正电子等离子体中无碰撞相对论冲击波的机械结构和热化特性。考虑垂直于磁场方向传播的冲击。结果表明，这些冲击波是存在的，并且它们完全由上游坡印廷通量与上游动能通量之比参数化。显示了朗肯-于贡尼奥激波跳跃条件因波波动的存在而被修改的方式，并且它们用于提供这些无碰撞激波流的宏观描述。讨论了 2D 模拟的结果，该结果证明了这些结果的普遍性超出了 1D 情况的假设。推测热化机制是激波前沿相干反射粒子形成同步加速器脉泽。由于下游介质已热化，因此有人认为纯正电子等离子体中的垂直激波不适合作为非热粒子加速器。 40 参考文献
One-dimensional particle-in-cell plasma simulations are used to examine the mechanical structure and thermalization properties of collisionless relativistic shock waves in electron-positron plasmas. Shocks propagating perpendicularly to the magnetic field direction are considered. It is shown that these shock waves exist, and that they are completely parameterized by the ratio of the upstream Poynting flux to the upstream kinetic energy flux. The way in which the Rankine-Hugoniot shock jump conditions are modified by the presence of wave fluctuations is shown, and they are used to provide a macroscopic description of these collisionless shock flows. The results of a 2D simulation that demonstrates the generality of these results beyond the assumption of the 1D case are discussed. It is suggested that the thermalization mechanism is the formation of a synchrotron maser by the coherently reflected particles in the shock front. Because the downstream medium is thermalized, it is argued that perpendicular shocks in pure electron-positron plasmas are not candidates as nonthermal particle accelerators. 40 refs.