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首页> 外文期刊>Planetary and space science >The exosphere of Titan and its interaction with the kronian magnetosphere: MIMI observations and modeling
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The exosphere of Titan and its interaction with the kronian magnetosphere: MIMI observations and modeling

机译：泰坦球外圈及其与克朗磁层的相互作用：MIMI观测和模拟

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Titan's nitrogen-rich atmosphere is directly bombarded by energetic ions, due to its lack of a significant intrinsic magnetic field. Singly charged energetic ions from Saturn magnetosphere undergo charge exchange collisions with neutral atoms in Titan's exosphere, being transformed into energetic neutral atoms (ENAs). The ion and neutral camera (INCA), one of the three sensors that comprise the magnetosphere imaging instrument on the Cassini/Huygens mission to Saturn and Titan, images the ENA emissions from various ion/ gas interaction regions in the Saturnian magnetosphere. During Cassinis second orbit around Saturn the spacecraft performed the Ta Titan flyby (26 October 2004), at an altitude of only 1174 km. INCA data acquired during this targeted close flyby not only confirm model predictions of dominant finite ion gyroradii effects, but also reveal a much more complex interaction. These observations are analyzed and compared to simulations. A new Titan exosphere model is then proposed.
机译：土卫六的富氮气氛由于缺乏明显的固有磁场而直接被高能离子轰击。来自土星磁层的单电荷高能离子与土卫六外流层中的中性原子发生电荷交换碰撞，被转化为高能中性原子（ENA）。离子和中性相机（INCA）是构成前往土星和土卫六的卡西尼/惠更斯飞行任务的磁层成像仪器的三个传感器之一，它对来自土星磁层中各个离子/气体相互作用区域的ENA排放进行成像。在卡西尼斯（Cassinis）绕土星的第二轨道期间，该航天器在仅1174公里的高度上执行了塔坦飞越（2004年10月26日）。在该目标近距离飞行中获得的INCA数据不仅证实了对有限离子陀螺半径优势的模型预测，而且还揭示了更为复杂的相互作用。分析这些观察结果并将其与模拟进行比较。然后提出了一个新的泰坦系外层模型。

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