Magnetosphere–ionosphere coupling is representative of a class of astrophysical problems involving the interaction between very different plasma regimes that are connected by magnetic fields. It is a major issue of the planet’s (e.g., Earth, Jupiter, Saturn) system how the magnetospheric plasma is coupled to the planet’s ionosphere/atmosphere. Due to their roles on energy transport and conversion in the terrestrial magnetosphere, dipolarization fronts (DFs) in the magnetotail have been intensively studied. While the energy may also be transported toward the ionosphere during the magnetosphere–ionosphere coupling, the coupling processes during DF events remain unclear. Using high-quality MMS and Swarm measurements, we present new conjugated observations of ultralow-frequency waves associated with the DF in the magnetotail and multiscale field-aligned currents (FACs) in the ionosphere. The tail large-amplitude low-frequency magnetic disturbances and associated FACs were found conn...

中文翻译：

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超低频波在磁层双极化锋面与地球电离层之间的耦合

磁层与电离层的耦合代表了一类天体物理问题，涉及通过磁场连接的非常不同的等离子体状态之间的相互作用。磁层等离子体如何与行星的电离层/大气层耦合是行星系统（例如地球，木星，土星）的主要问题。由于它们在地球磁层中的能量传输和转换中的作用，磁尾中的双极化前沿（DFs）已经得到了深入的研究。尽管在磁层-电离层耦合过程中能量也可能向电离层传输，但DF事件期间的耦合过程仍然不清楚。使用高质量的MMS和Swarm测量，我们提出了与磁尾中的DF相关的超低频波和电离层中的多尺度场对准电流（FAC）的新共轭观测。发现尾部大振幅低频电磁干扰及相关的FACs。