Magnetosheath jets are localized fast flows with enhanced dynamic pressure. When they supermagnetosonically compress the ambient magnetosheath plasma, a bow wave or shock can form ahead of them. Such a bow wave was recently observed to accelerate ions and possibly electrons. The ion acceleration process was previously analyzed, but the electron acceleration process remains largely unexplored. Here we use multipoint observations by Time History of Events and Macroscale during Substorms from three events to determine whether and how magnetosheath jet‐driven bow waves can accelerate electrons. We show that when suprathermal electrons in the ambient magnetosheath convect toward a bow wave, some electrons are shock‐drift accelerated and reflected toward the ambient magnetosheath and others continue moving downstream of the bow wave resulting in bidirectional motion. Our study indicates that magnetosheath jet‐driven bow waves can result in additional energization of suprathermal electrons in the magnetosheath. It implies that magnetosheath jets can increase the efficiency of electron acceleration at planetary bow shocks or other similar astrophysical environments.

中文翻译：

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磁热喷射驱动弓形波对电子的加速作用

磁石喷射流是局部快速流动，具有增强的动态压力。当它们以超音速压缩周围的磁石等离子体时，会在它们前面形成弓形波或冲击。最近观察到这种弓形波使离子加速并可能加速电子。先前已经对离子加速过程进行了分析，但是电子加速过程仍未开发。在这里，我们使用来自三个事件的“事件的时间历史”和“亚暴期间的宏观尺度”的多点观测，来确定磁石喷射驱动的弓形波是否以及如何加速电子。我们证明，当环境磁热中的超热电子对流向弓形波时，一些电子被冲击漂移加速并反射到周围的磁石表面，而另一些电子继续向弓形波的下游移动，从而导致双向运动。我们的研究表明，磁石喷射流驱动的弓形波可以导致磁石中超热电子的额外通电。这暗示着，在行星弓撞击或其他类似的天体物理环境下，磁石荒射流可以提高电子加速的效率。