Magnetic reconnection is a fundamental process in collisionless space plasma environment, and plasma waves relevant to the kinetic interactions can have a significant impact on the multiscale behavior of reconnection. Here, we present Magnetospheric Multiscale (MMS) observations during an encounter of an X line of symmetric magnetic reconnection in the magnetotail. The X line is characterized by reversals of ion and electron jets and electromagnetic fields, agyrotropic electron velocity distribution functions (VDFs), and an electron-scale current sheet. MMS observe large-amplitude nonlinear upper-hybrid (UH) waves on both sides of the neutral line, and the wave amplitudes have highly localized distribution along the normal direction. The inbound meandering electrons drive the UH waves, releasing the free energy stored from the reconnection electric field along the meandering trajectories. The interaction between the meandering electrons and the UH waves may modify the balance of the reconnection electric field around the X line.

中文翻译：

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由绕磁重联 X 线蜿蜒电子驱动的上混合波

磁重联是无碰撞空间等离子体环境中的基本过程，与动力学相互作用相关的等离子体波会对重联的多尺度行为产生重大影响。在这里，我们展示了在磁尾中遇到 X 线对称磁重联期间的磁层多尺度 (MMS) 观测。X 线的特点是离子和电子射流和电磁场的反转、回旋电子速度分布函数 (VDF) 和电子级电流片。MMS在中线两侧观测到大振幅非线性上混合（UH）波，波幅沿法线方向具有高度局部化分布。输入的蜿蜒电子驱动 UH 波，沿着蜿蜒的轨迹释放从重新连接电场中存储的自由能。蜿蜒电子和 UH 波之间的相互作用可能会改变 X 线周围重联电场的平衡。