.png){kind=icon}
返回
Return Currents in Collisionless Shocks
.png){kind=icon}
OA
AI
DOI：10.3847/1538-4357/ad3e75.png)
.png){kind=icon}
原文求助.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
Collisionless shocks tend to send charged particles into the upstream, driving electric currents through the plasma. Using kinetic particle-in-cell simulations, we investigate how the background thermal plasma neutralizes such currents in the upstream of quasi-parallel non-relativistic electron-proton shocks. We observe distinct processes in different regions: the far upstream, the shock precursor, and the shock foot. In the far upstream, the current is carried by nonthermal protons, which drive electrostatic modes and produce suprathermal electrons that move toward upstream infinity. Closer to the shock (in the precursor), both the current density and the momentum flux of the beam increase, which leads to electromagnetic streaming instabilities that contribute to the thermalization of suprathermal electrons. At the shock foot, these electrons are exposed to shock-reflected protons, resulting in a two-stream type instability. We analyze these processes and the resulting heating through particle tracking and controlled simulations. In particular, we show that the instability at the shock foot can make the effective thermal speed of electrons comparable to the drift speed of the reflected protons. These findings are important for understanding both the magnetic field amplification and the processes that may lead to the injection of suprathermal electrons into diffusive shock acceleration.
Keyword:
NONTHERMAL ELECTRON ACCELERATION
PARTICLE-ACCELERATION
KINETIC SIMULATIONS
ION-ACCELERATION
MAGNETIC-FIELD
PARALLEL SHOCKS
AMPLIFICATION
INJECTION
ENERGY
期刊
IF:
5.4
论文数:
8.3W
被引数:
32.0W
机构
引用论文
SIMULATIONS AND THEORY OF ION INJECTION AT NON-RELATIVISTIC COLLISIONLESS SHOCKS非相对论无碰撞激波下离子注入的理论与模拟
OAAI
.png){kind=icon}
OAAI分享收藏Spectroscopic properties of electrochemically populated electronic states in nanostructured TiO2 films: anatase versus rutile纳米结构TiO2薄膜中电化学填充电子态的光谱性质: 锐钛矿与金红石
PREAI
分享收藏分享收藏
查看更多内容