论文标题
木星的不寻常磁层拓扑结构如何结构其极光
How Jupiter's Unusual Magnetospheric Topology Structures Its Aurora
论文作者
论文摘要
木星的明亮持续极极性极光和地球的深色极性区域表明，行星的磁层拓扑是非常不同的。高分辨率的全球模拟表明，星际磁场和jovian磁场之间接口处的重新连接速率太慢，无法在行星旋转的时间范围内产生磁性开放的，类似地球的极性盖，仅导致一个小新月与磁性磁力互连的小新月与间磁场磁场互连。大多数Jovian极盖是由螺旋磁通量螺纹螺纹的螺旋磁通量，该磁通量闭合行星内部，延伸至外部磁层，并在其黎明侧侧面堆积，在那里快速的差速器旋转将野外线延伸。这种不寻常的磁性拓扑为木星独特的极光形态提供了新的见解。
Jupiter's bright persistent polar aurora and Earth's dark polar region indicate that the planets' magnetospheric topologies are very different. High-resolution global simulations show that the reconnection rate at the interface between the interplanetary and jovian magnetic fields is too slow to generate a magnetically open, Earth-like polar cap on the timescale of planetary rotation, resulting in only a small crescent-shaped region of magnetic flux interconnected with the interplanetary magnetic field. Most of the jovian polar cap is threaded by helical magnetic flux that closes within the planetary interior, extends into the outer magnetosphere and piles-up near its dawnside flank where fast differential plasma rotation pulls the field lines sunward. This unusual magnetic topology provides new insights into Jupiter's distinctive auroral morphology.
