论文标题
关于湍流结构在地球的弓形冲击中的传播
On the transmission of turbulent structures across the Earth's Bow Shock
论文作者
论文摘要
无碰撞冲击和等离子体湍流是广泛的天体物理系统的关键成分。在这里，使用航天器观测和局部数值模拟的组合解决了冲击驱动性相互作用，尤其是在准垂直地球的弓形冲击中的完全发育的湍流传播。风（上游）和MMS（下游）航天器之间的对齐方式用于研究湍流结构在冲击中的传播，揭示了其下游中其磁性螺旋含量的增加。局部动力学模拟，其中湍流结构的动力学通过垂直冲击的传播遵循，证实了这种情况，揭示了观察到的磁性螺旋性的增加与冲击前沿湍流结构的压缩有关。
Collisionless shocks and plasma turbulence are crucial ingredients for a broad range of astrophysical systems. The shock-turbulence interaction, and in particular the transmission of fully developed turbulence across the quasi-perpendicular Earth's bow shock, is here addressed using a combination of spacecraft observations and local numerical simulations. An alignment between the Wind (upstream) and MMS (downstream) spacecraft is used to study the transmission of turbulent structures across the shock, revealing an increase of their magnetic helicity content in its downstream. Local kinetic simulations, in which the dynamics of turbulent structures is followed through their transmission across a perpendicular shock, confirm this scenario, revealing that the observed magnetic helicity increase is associated with the compression of turbulent structures at the shock front.
