Abstract

In this paper, we consider the processes associated with the formation of a so-called foreshock region ahead of the front of a near-Earth collisionless shock wave. In the proposed theoretical model, ions in the ramp or the front of the shock wave are shown to be accelerated to significant energies. The physical conditions under which these ions accelerated in the shock front end up in front of the shock front and move away from it, as a result of which they are sometimes referred to the category of reflected ions, are found. It is concluded that this population of reflected energetic ions (they are most often called “longitudinal beams” or field-aligned beams) plays the main role in the formation of the ion foreshock boundary. The main properties of the longitudinal beams that follow from the considered model are compared with observational data obtained from a spacecraft.

中文翻译：

---

近地冲击波的离子前震：理论模型和观测数据

摘要

在本文中，我们考虑了与在近地无碰撞冲击波前部形成所谓的前震区相关的过程。在提出的理论模型中，斜坡或冲击波前部的离子被证明被加速到显着的能量。找到了这些离子在激波前沿加速的物理条件，最终到达激波前沿并远离它，因此它们有时被称为反射离子的类别。得出的结论是，这群反射高能离子（它们通常被称为“纵向束”或场对齐束）在离子前震边界的形成中起主要作用。