Magnetosheath jets and plasmoids are very common phenomena downstream of Earth’s quasi-parallel bow shock. As the increase of the dynamic pressure is one of the principal characteristics of magnetosheath jets, the embedded paramagnetic plasmoids have been considered as an special case of the former. Although the properties of both types of structures have been widely studied during the last 20 years, their formation mechanisms have not been examined thoroughly. In this work we perform a 2D local hybrid simulation (kinetic ions – fluid electrons) of a quasi-parallel ( θ Bn = 15°), supercritical ( M A = 7) collisionless shock in order to study these mechanisms. Specifically, we analyze the formation of one jet and one plasmoid, showing for the first time that they can be produced by different mechanisms related to the same shock. In our simulation, the magnetosheath jet is formed according to the mechanism proposed by Hietala, wh...

中文翻译：

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磁石射流和类等离子体：混合模拟的特征和形成机理

磁石鞘射流和等离子体是地球准平行弓形激波下游的非常普遍的现象。由于动压力的增加是磁石表面射流的主要特征之一，因此埋入的顺磁等离子体被认为是前者的特例。尽管在过去的20年中对这两种类型的结构的性质进行了广泛的研究，但尚未对它们的形成机理进行彻底的研究。在这项工作中，我们对准平行（θBn = 15°），超临界（MA = 7）无碰撞冲击进行二维局部混合模拟（运动离子–流体电子），以研究这些机理。具体来说，我们分析了一个喷射流和一个等离子体的形成，这首次表明它们可以由与同一冲击相关的不同机制产生。在我们的模拟中