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Structure and dynamics of Saturn's outer magnetosphere and boundary regions

机译:土星外磁层及其边界区域的结构和动力学

摘要

In 1979-1981, the three USA spacecraft Pioneer 11 and Voyagers 1 and 2 discovered and explored the magnetosphere of Saturn to the limited extent possible on flyby trajectories. Considerable variation in the locations of the bow shock (BS) and magnetopause (MP) surfaces were observed in association with variable solar wind conditions and, during the Voyager 2 encounter, possible immersion in Jupiter's distant magnetic tail. The limited number of BS and MP crossings were concentrated near the subsolar region and the dawn terminator, and that fact, together with the temporal variability, makes it difficult to assess the three dimensional shape of the sunward magnetospheric boundary. The combined BS and MP crossing positions from the three spacecraft yield an average BS-to-MP stagnation point distance ratio of 1.29 +/- 0.10. This is near the 1.33 value for the Earth's magnetosphere, implying a similar sunward shape at Saturn. Study of the structure and dynamical behavior of the outer magnetosphere, both in the sunward hemisphere and the magnetotail region using combined plasma and magnetic field data, suggest that Saturn's magnetosphere is more similar to that of Earth than that of Jupiter.
机译:在1979-1981年间,三架美国航天器Pioneer 11和Voyagers 1和Voyagers 2在有限的飞越轨道上发现并探索了土星的磁层。观察到弓激波(BS)和磁更年期(MP)表面位置的变化与太阳风的变化有关,并且在旅行者2号遭遇期间,可能浸没在木星遥远的磁尾中。有限的BS和MP交叉点集中在太阳下区域和黎明终结者附近,这一事实加上时间的变化性使得难以评估朝阳磁层边界的三维形状。来自这三个航天器的BS和MP组合交叉位置得出的BS与MP停滞点平均距离比为1.29 +/- 0.10。这接近于地球磁层的1.33值,这意味着土星的朝阳形状类似。结合等离子体和磁场数据,研究了朝阳半球和磁尾区域外磁层的结构和动力学行为,这表明土星的磁层比木星的磁层更类似于地球。

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