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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >A global hybrid model for Titan's interaction with the Kronian plasma: Application to the Cassini Ta flyby
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A global hybrid model for Titan's interaction with the Kronian plasma: Application to the Cassini Ta flyby

机译：全球混合模型对泰坦的交互卡西尼号Ta Kronian等离子体:应用程序飞越

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摘要

The interaction between the corotating magnetospheric plasma of Saturn and the exosphere of Titan is investigated by means of a three-dimensional and multispecies hybrid simulation model coupling charged and neutral species via three ionizing mechanisms: the absorption of extreme ultraviolet solar photons, the impacts of magnetospheric electrons, and the charge exchange reactions between ions and neutral atoms or molecules. The simulation model includes the low and energetic components of the magnetospheric plasma, the main exospheric neutral species (molecular hydrogen and nitrogen and methane), and the atmospheric slowing down of charged particles penetrating below the exobase. Ionization rates of the exospheric species are computed as consistently as possible for each of the three ionizing mechanisms by making use of the relevant local number densities and cross sections or ionization frequencies. This model is thus able to provide a priori estimates of the escaping fluxes of exospheric ionic species and to separate for the contributions of the different ionization sources. A simulation run has been made for the conditions encountered by spacecraft Cassini during flyby Ta of Titan on 26 October 2004. Results are presented to characterize the main features of the simulated plasma environment of Titan: the induced magnetic tail and the flow of magnetospheric plasma around Titan, as well as the wake and the acceleration of the planetary plasma. Considering the coarse spatial resolution of the present simulation, these features are in reasonable agreement with in situ plasma measurements made by spacecraft Cassini.
机译：共转之间的交互土星磁层等离子体和外逸层泰坦是通过调查三维和multispecies混合动力仿真模型耦合和中性物种通过三个电离机制:极端的紫外线吸收太阳能光子,磁性层的电子的影响,离子和之间的电荷交换反应中性的原子或分子。包括低和充满活力的组成部分主要外逸层的磁性层的等离子体中立的物种(分子氢和氮和甲烷),大气减速带电粒子穿透在范围内。外逸层的物种的电离率尽可能一致的计算利用三个电离机制有关当地的数密度和交叉部分或电离频率。因此能够提供的先验估计逃离外逸层的离子物种和通量分离的贡献不同的电离源。为遇到的条件了吗卡西尼号飞船在飞越泰坦26日的助教2004年10月。描述模拟的主要特点泰坦的等离子体环境:诱导磁尾巴和磁性层的等离子体的流动泰坦,之后和加速度行星的等离子体。空间分辨率的模拟,这些特性是合理的协议原位测量等离子体由航天器卡西尼。

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