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首页> 外文期刊>Planetary and space science >Jovian plasma torus interaction with Europa: 3D hybrid kinetic simulation.First results
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Jovian plasma torus interaction with Europa: 3D hybrid kinetic simulation.First results

机译:木卫二血浆环面与欧罗巴的相互作用:3D混合动力学模拟。第一个结果

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摘要

The hybrid kinetic model supports comprehensive simulation of the interaction between different spatial and energetic elements of the Europa moon-magnetosphere system with respect to variable upstream magnetic field and flux or density distributions of plasma and energetic ions, electrons, and neutral atoms. This capability is critical for improving the interpretation of the existing Europa flyby measurements from the Galileo orbiter mission, and for planning flyby and orbital measurements (including the surface and atmospheric compositions) for future missions. The simulations are based on recent models of the atmosphere of Europa (Cassidy et al., 2007; Shematovich et al., 2005). In contrast to previous approaches with MHD simulations, the hybrid model allows us to fully take into account the finite gyroradius effect and electron pressure, and to correctly estimate the ion velocity distribution and the fluxes along the magnetic field (assuming an initial Maxwellian velocity distribution for upstream background ions). Non-thermal distributions of upstream plasma will be addressed in future work. Photoionization, electron-impact ionization, charge exchange and collisions between the ions and neutrals are also included in our model. We consider two models for background plasma: (a) with CT ions; (b) with CF and S ions. The majority of O_2 atmosphere is thermal with an extended cold population (Cassidy et al., 2007). A few first simulations already include an induced magnetic dipole; however, several important effects of induced magnetic fields arising from oceanic shell conductivity will be addressed in later work.
机译:混合动力学模型支持欧罗巴月球-磁层系统不同空间和高能元素之间的相互作用的综合模拟,涉及可变上游磁场以及等离子和高能离子,电子和中性原子的通量或密度分布。对于改进伽利略轨道飞行器对现有欧罗巴飞越测量的解释,以及为未来的飞行计划飞越和轨道测量(包括地面和大气成分),此功能至关重要。该模拟基于欧罗巴大气层的最新模型(Cassidy等,2007; Shematovich等,2005)。与以前的带有MHD模拟的方法相比,混合模型使我们能够充分考虑有限的陀螺半径效应和电子压力,并正确估计离子速度分布和沿磁场的通量(假设初始麦克斯韦速度分布为上游背景离子)。上游等离子体的非热分布将在未来的工作中解决。光电离,电子碰撞电离,电荷交换以及离子与中性离子之间的碰撞也包括在我们的模型中。我们考虑背景等离子体的两种模型:(a)CT离子; (b)具有CF和S离子。大多数O_2大气是热气,冷气种群扩展(Cassidy等,2007)。一些最初的模拟已经包括感应磁偶极子。但是,在以后的工作中将解决由海洋壳电导率引起的感应磁场的几个重要影响。

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  • 来源
    《Planetary and space science》 |2010年第13期|p.1681-1691|共11页
  • 作者单位

    Coddard Earth Science and Technology Center. UMBC/NASA CSFC, Code 673, Bid. 21, Rm. 025, 8800 Creenbelt Rd., Creenbelt, MD 20771, USA,Department of Problems of Physics and Energetics, Moscow Institute of Physics and Technology, Russia,Dialogue Science, A.A Dorodnitsyn Computing Center Russian Academy of Sciences, Vavilov St. 40, 119991 Moscow, Russia;

    NASA Coddard Space Flight Center, Creenbelt, MD 20771, USA;

    Hampton University, Hampton, VA, USA;

    NASA Coddard Space Flight Center, Creenbelt, MD 20771, USA;

    NASA Coddard Space Flight Center, Creenbelt, MD 20771, USA;

    NASA Coddard Space Flight Center, Creenbelt, MD 20771, USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Europa; jovian magnetosphere; plasma; magnetic fields; ion composition;

    机译:欧罗巴;木星磁层等离子体;磁场;离子组成;

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