土星Magnetosphere中的共转磁重联点
Corotating Magnetic Reconnection Site in Saturn's Magnetosphere
摘要：
使用测量从卡西尼号飞船在土星的磁层，我们提出了一个三维物理图片的共转重联网站，它只能由内部产生的源驱动。我们的研究结果表明，共转磁重联可以驱动土星磁层中的电流片膨胀，从而产生电子的费米加速。这个重连点持续的时间超过了土星的一个自转周期。土星磁重联站点的持久和共转性质表明，磁重联在驱动磁层动力学方面具有根本不同的作用（例如，地球上的极光降水。我们的共转重联图像也可能揭示太阳系内外快速旋转的磁化等离子体环境。
英文摘要：
Using measurements from the Cassini spacecraft in Saturn's magnetosphere, we propose a 3D physical picture of a corotating reconnection site, which can only be driven by an internally generated source. Our results demonstrate that the corotating magnetic reconnection can drive an expansion of the current sheet in Saturn's magnetosphere and, consequently, can produce Fermi acceleration of electrons. This reconnection site lasted for longer than one of Saturn's rotation period. The long-lasting and corotating natures of the magnetic reconnection site at Saturn suggest fundamentally different roles of magnetic reconnection in driving magnetospheric dynamics (e.g., the auroral precipitation) from the Earth. Our corotating reconnection picture could also potentially shed light on the fast rotating magnetized plasma environments in the solar system and beyond.
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