Ion-acoustic shocks with reflected ions: modelling and particle-in-cell simulations
Ion-acoustic shocks with reflected ions: modelling and particle-in-cell simulations
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反射离子的离子声冲击：建模和细胞内粒子模拟
DOI：
10.1017/s002237781500077x
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发表时间：
2015
影响因子：
2.5
通讯作者：
M. Malkov
中科院分区：
文献类型：
--
作者：
T. Liseykina;G. Dudnikova;V. Vshivkov;M. Malkov
非相对论性无碰撞激波在太空和天体物理等离子体中广泛存在，被称为有效的粒子加速器。然而，我们对无碰撞冲击的理解，包括它们的结构和它们加速粒子的机制，仍然不完整。本文给出了基于一维动力学近似的离子和电子具有实际质量比的无碰撞冲击的数值模拟结果。特别强调了冲击反射离子作为冲击耗散的主要驱动力。从冲击参数的角度研究了反射效率、反射粒子的速度分布和冲击静电结构。讨论了粒子加速在地球物理和天体物理冲击中的应用。
Non-relativistic collisionless shock waves are widespread in space and astrophysical plasmas and are known as efficient particle accelerators. However, our understanding of collisionless shocks, including their structure and the mechanisms whereby they accelerate particles, remains incomplete. We present here the results of numerical modelling of an ion-acoustic collisionless shock based on the one-dimensional kinetic approximation for both electrons and ions with a real mass ratio. Special emphasis is paid to the shock-reflected ions as the main driver of shock dissipation. The reflection efficiency, the velocity distribution of reflected particles and the shock electrostatic structure are studied in terms of the shock parameters. Applications to particle acceleration in geophysical and astrophysical shocks are discussed.