论文标题
冲击波中的颗粒加速度传播到不均匀培养基
Particle acceleration in a shock wave propagating to an inhomogeneous medium
论文作者
论文摘要
我们研究上游密度波动对蒙特卡洛模拟扩散冲击加速的影响。模拟表明，通过在冲击锋处产生的声波在冲击下游区域中重新计算颗粒。估计声波湍流加速的时间尺度。我们提出了在冲击锋周围加速的颗粒的新反应。加速粒子通过Drury不稳定性产生上游密度的波动，这些不稳定性被冲击转化为下游声波。下游的声波改变了冲击锋周围加速粒子的动量光谱。这种新的背部反应会影响加速颗粒的发射，从而对扩散冲击加速度的加速效率产生了新的限制。
We investigate effects of upstream density fluctuations on the diffusive shock acceleration by Monte Carlo simulations. The simulations show that particles are reaccelerated in the shock downstream region by a sound wave generated at the shock front. The time scale of turbulent acceleration by the sound wave is estimated. We propose a new back reaction of particles accelerated around the shock front. The accelerated particles generate the upstream density fluctuations by the Drury instability, which are converted to the downstream sound waves by the shock. The downstream sound waves modify the momentum spectrum of particles accelerated around the shock front. This new back reaction affects emission from the accelerated particles, which gives a new constraint on the acceleration efficiency of the diffusive shock acceleration.
