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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >The lower exosphere of Titan: Energetic neutral atoms absorption and imaging
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The lower exosphere of Titan: Energetic neutral atoms absorption and imaging

机译：泰坦的较低的外逸层:精力充沛的中立原子吸收和成像

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摘要

The Saturn magnetosphere interacts with the Titan atmosphere through various mechanisms. One of them leads, by charge exchange reactions between the energetic Saturnian ions and the exospheric neutrals of Titan, to the production of energetic neutral atoms (ENAs). The Ion and Neutral Camera (INCA), one of the three sensors that comprise the Magnetosphere Imaging Instrument (MIMI) on the Cassini/Huygens mission to Saturn and Titan, images the ENA emissions in the Saturnian magnetosphere. This study focuses on the ENA imaging of Titan (for 20–50 keV H ENAs), with the example of the Ta Titan flyby (26 October 2004): our objective is to understand the positioning of the ENA halo observed around Titan. Thus we investigate the main ENA loss mechanisms, such as the finite gyroradii effects for the parent ions, or the charge stripping with exospheric neutrals. We show that multiple stripping and charge exchange reactions have to be taken into account to understand the ENA dynamics. The use of an analytical approach, taking into account these reactions, combined with a reprocessing of the INCA data, allows us to reproduce the ENA images of the Ta flyby and indicates a lower limit for ENA emission around the exobase. However, the dynamics of energetic particles through the Titan atmosphere remains complex, with an inconsistency between the ENA imaging at low and high altitudes.
机译：土星磁层与泰坦大气中通过各种机制。他们领导,之间的电荷交换反应精力充沛的土星的离子和外大气层的泰坦的中性色,充满活力的生产中性原子(ENAs)。(印加),三个传感器组成磁气圈成像仪器(咪咪)卡西尼号土星/惠更斯的使命和泰坦,图像在土星的ENA排放磁气圈。成像的泰坦(20 - 50 keV H ENAs)的助教的例子泰坦飞越(2004年10月26日):我们的目标是理解的定位周围的ENA光环观察泰坦。调查的主要ENA损失机制,如父离子gyroradii效果有限,或与外大气层的中性电荷剥离。我们表明,多个剥离和电荷交换反应必须被考虑了解ENA动力学。分析的方法,考虑到这些反应,结合的后处理印加人的数据,让我们重现ENA图像助教的飞越,表明一个下限ENA在范围内发射。高能粒子动力学通过泰坦气氛依然复杂,矛盾ENA成像之间的低和高海拔。

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