Morphology of the magnetic field near Titan: Hybrid model study of the Cassini T9 flyby
Morphology of the magnetic field near Titan: Hybrid model study of the Cassini T9 flyby
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土卫六附近磁场的形态：卡西尼 T9 飞越的混合模型研究
DOI：
10.1029/2007gl030827
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发表时间：
2007
影响因子：
5.2
通讯作者：
F. Neubauer
中科院分区：
文献类型：
--
作者：
E. Kallio;I. Sillanpää;R. Jarvinen;P. Janhunen;M. Dougherty;C. Bertucci;F. Neubauer
我们通过一个三维数值准中性混合模型（HYB‐Titan）研究了土卫六附近磁场的变形和形态。我们分析了两次运行，一次是由氧（O+）离子和质子（H+）组成的子旋转等离子体，另一次是只有质子。我们发现，这两种情况下的结果在阿尔文翼状通量管的生成。与仅质子的情况相比，富氧流情况下磁场的方向和大小与卡西尼号在2006年12月26日飞越泰坦T9时的磁场观测结果更一致，这表明子旋转等离子体包含重离子。富氧运行也支持以下假设：（1）子旋转流动方向与理想旋转流动方向偏移了30°-40°，（2）当T9飞越泰坦时，航天器在尾部靠近泰坦空间的阳光照射侧磁性连接。
We study the deformation and morphology of the magnetic field near Titan by a three‐dimensional numerical quasi‐neutral hybrid model (HYB‐Titan). We analyze two runs, one in which the sub‐rotating plasma consists of oxygen (O+) ions and protons (H+) and another with only protons. We find that both cases result in the generation of Alfvén wing‐like flux tubes. In comparison with the proton‐only case, the direction and magnitude of the magnetic field in the oxygen‐rich flow case are in better agreement with Cassini magnetic field observations during its Titan T9 flyby on Dec. 26, 2006, suggesting that the sub‐rotating plasma contained heavy ions. The oxygen‐rich run also supports the hypotheses that (1) the sub‐rotating flow direction was offset by ∼30°–40° from the ideal rotating flow direction and that (2) the spacecraft was magnetically connected to the sunlit side of near‐Titan space in the tail when it approached Titan on the T9 flyby.