论文标题
高弹药非递延倾斜冲击的电子预测
The electron foreshock at high-Mach-number nonrelativistic oblique shocks
论文作者
论文摘要
在宇宙中，恒星之外的物质和紧凑的物体主要由无碰撞血浆组成。超音速等离子体流与障碍物的相互作用导致无碰撞冲击通常与强烈的非热辐射和宇宙射线颗粒的产生有关。通过模拟超新星残留物中的非相关高弹药冲击的模拟，我们研究了相对论电子束在倾斜冲击的扩展前封面中激发的不稳定性。内部和外部前置区域中的相空间分布是通过对冲击的粒子模拟来得出的，并用作具有周期性边界条件的模拟的初始条件，以研究其对平衡的松弛。我们发现，观察到的电子束不稳定性与线性分散分析的预测非常吻合：静电电子声音不稳定性占主导地位的外部区域，而内部预击中的较密集的电子束驱动旋转的gyroresonant倾斜倾斜的倾斜倾斜 - 倾斜的人。
In the Universe matter outside of stars and compact objects is mostly composed of collisionless plasma. The interaction of a supersonic plasma flow with an obstacle results in collisionless shocks that are often associated with intense nonthermal radiation and the production of cosmic ray particles. Motivated by simulations of non-relativistic high-Mach-number shocks in supernova remnants, we investigate the instabilities excited by relativistic electron beams in the extended foreshock of oblique shocks. The phase-space distributions in the inner and outer foreshock regions are derived with a Particle-in-Cell simulation of the shock and used as initial conditions for simulations with periodic boundary conditions to study their relaxation towards equilibrium. We find that the observed electron-beam instabilities agree very well with the predictions of a linear dispersion analysis: the electrostatic electron-acoustic instability dominates in the outer region of the foreshock, while the denser electron beams in the inner foreshock drive the gyroresonant oblique-whistler instability.
