A Persistent, Large-Scale, and Ordered Electrodynamic Connection Between Saturn and Its Main Rings
A Persistent, Large-Scale, and Ordered Electrodynamic Connection Between Saturn and Its Main Rings
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土星及其主环之间持久的、大规模的、有序的电动连接
DOI：
10.1029/2019gl083541
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发表时间：
2019
影响因子：
5.2
通讯作者：
Sulaiman A
中科院分区：
文献类型：
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作者：
Sulaiman A
极光嘶嘶声发射在行星磁层中无处不在，特别是在存在电流系统的区域。它们通常用于诊断导电体之间的电动耦合，从而使极光和月球连接的磁场线成为其检测的主要位置。然而，土星环作为动态导电体的作用一直难以捉摸，并且引起了社会的极大兴趣。卡西尼号的大结局轨道提供了一个独特的机会来直接采样连接到主环的磁场线。在这里，我们提供了强有力的证据，证明极光嘶嘶声的持续存在和有组织的存在明显与主环有关。这与最近的观察结果形成鲜明对比，最近的观察表明土星环可能是场对准电流的障碍。我们的研究结果提供了土星环作为一个动态系统的新观点，该系统与行星处于连续有序的电动耦合状态。
Auroral hiss emissions are ubiquitous in planetary magnetospheres, particularly in regions where electric current systems are present. They are generally diagnostic of electrodynamic coupling between conductive bodies, thus making auroral and moon‐connected magnetic field lines prime locations for their detection. However, the role of Saturn's rings as a dynamic conductive body has been elusive and of great interest to the community. Cassini's Grand Finale orbits afforded a unique opportunity to directly sample magnetic field lines connected to the main rings. Here we provide strong evidence for the persistent and organized presence of auroral hiss demonstrably associated with the main rings. This is in contrast to recent observations suggesting that Saturn's rings may be barriers to field‐aligned currents. Our results provide a new view of Saturn's rings as a dynamic system that is in continuous and ordered electrodynamic coupling with the planet.