论文标题
将微型类型更改为上游波浪中血浆中的Alfvénic震动
Change of a Weibel-type to an Alfvénic shock in pair plasma by upstream waves
论文作者
论文摘要
我们使用粒子中的粒子（PIC）模拟对等离子中的平行冲击如何反应上游波，这些冲击是由逃逸的下游颗粒驱动的。最初，电击在二维模拟中通过磁性细丝（Beam-Weibel）的不稳定性持续。逃脱的颗粒驱动上游静电束的不稳定性。这些波对上游等离子体的修饰几乎不会影响冲击。随着时间的流逝，逃逸颗粒的密度降低和升高的温度淬灭了光束不稳定性。比垂直于磁场的更大的热能破坏了配对的模式。在上游等离子体的其余框架中，生长的配对alfvén波的组速度低于冲击的速度，而后者则赶上了波浪。累积的配对alfvén波逐渐改变了二维模拟中的冲击，从芯片类型的冲击变为Alfvénic减震器，其MACH数量约为我们最初的条件，大约为6。
We examine with particle-in-cell (PIC) simulations how a parallel shock in pair plasma reacts to upstream waves, which are driven by escaping downstream particles. Initially, the shock is sustained in the two-dimensional simulation by a magnetic filamentation (beam-Weibel) instability. Escaping particles drive an electrostatic beam instability upstream. Modifications of the upstream plasma by these waves hardly affect the shock. In time, a decreasing density and increasing temperature of the escaping particles quench the beam instability. A larger thermal energy along than perpendicular to the magnetic field destabilizes the pair-Alfvén mode. In the rest frame of the upstream plasma, the group velocity of the growing pair-Alfvén waves is below that of the shock and the latter catches up with the waves. Accumulating pair-Alfvén waves gradually change the shock in the two-dimensional simulation from a Weibel-type shock into an Alfvénic shock with a Mach number that is about 6 for our initial conditions.
