Fast Particle Acceleration in 3D Hybrid Simulations of Quasiperpendicular Shocks
Fast Particle Acceleration in 3D Hybrid Simulations of Quasiperpendicular Shocks
复制标题
准垂直冲击 3D 混合模拟中的快速粒子加速
DOI：
10.1103/physrevlett.131.095201
复制
发表时间：
2023
影响因子：
8.6
通讯作者：
Caprioli, Damiano
中科院分区：
文献类型：
--
作者：
Orusa, Luca;Caprioli, Damiano
了解在无碰撞、非相对论性冲击波中粒子加速的条件对宇宙射线的起源很重要。我们使用混合动力（动力离子流体电子）动力学模拟研究粒子加速和磁场放大在非相对论，弱磁化，准垂直冲击。到目前为止，还没有自洽动力学模拟报告非热尾准垂直冲击。与2D模拟不同，3D运行表明质子自发地形成非热尾（即，来自热浴并且没有预先存在的磁湍流）。它们通过激波漂移加速而迅速加速，直到由它们向上游逃逸所确定的最大能量。我们讨论的影响，我们的结果的现象学的日光层冲击，超新星遗迹，和射电超新星。
Understanding the conditions conducive to particle acceleration at collisionless, nonrelativistic shocks is important for the origin of cosmic rays. We use hybrid (kinetic ions–fluid electrons) kinetic simulations to investigate particle acceleration and magnetic field amplification at nonrelativistic, weakly magnetized, quasiperpendicular shocks. So far, no self-consistent kinetic simulation has reported nonthermal tails at quasiperpendicular shocks. Unlike 2D simulations, 3D runs show that protons develop a nonthermal tail spontaneously (i.e., from the thermal bath and without preexisting magnetic turbulence). They are rapidly accelerated via shock drift acceleration up to a maximum energy determined by their escape upstream. We discuss the implications of our results for the phenomenology of heliospheric shocks, supernova remnants, and radio supernovae.