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首页> 外文期刊>Physics of plasmas >Charging and dynamics of dust particles in lunar photoelectron sheath
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Charging and dynamics of dust particles in lunar photoelectron sheath

机译：月球光电子鞘中尘埃颗粒的充电和动态

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摘要

Sunlight scattering from electrostatically charged floating particles is considered accountable for the lunar twilight observations of horizon glow and streamers. In this work, the dynamics of the fine charged particles within the photoelectron sheath over the sunlit lunar surface has been investigated. Accounting for the influence of solar radiation, solar wind plasma, and lunar gravity, the present transport model consistently takes account of the coexisting phenomenon of particle charging, and characteristic photoelectron sheath screening in deriving the vertical motion of the particle. As novel features, half Fermi-Dirac statistics of the photoelectron velocity in determining the electron population and the sheath structure through the Poisson equation, and anisotropic photoelectron flux in evaluating the particle charge as it traverses through the sheath, have adequately been included in the analysis. In this framework, the electrostatic sheath features are observed to dominate over the lunar gravity in determining the dynamics of smaller (nanometer) size grains; for instance, similar to 10nm sized particles detached from the lunar regolith with a finite velocity are shown to loft up to the kilometer altitude. Depending on the initial particle velocity and size, a parametric regime defining the particle hopping over the lunar surface has been identified.
机译：从静电浮动颗粒的阳光散射被认为是对地平线发光和飘带的月球暮光之城观测负责。在这项工作中，已经研究了在阳光光线表面上的光电子鞘内的细带粒子内的细带粒子的动态。占太阳辐射，太阳风等离子体和月球重力的影响，本运输模型始终考虑到颗粒充电的共存现象，以及在衍生颗粒的垂直运动中的特征光电子鞘筛选。作为新颖的特征，通过泊松方程确定电子群和护套结构的光电子速度的半费米DIRAC统计，以及在通过护套横穿时评估粒子电荷时的各向异性光电子通量在分析中充分包括在分析中。在该框架中，观察到静电鞘特征在确定较小（纳米）尺寸晶粒的动态时占据着月球重力;例如，类似于从月球重新旋转的10nm大小的粒子，其具有有限速度被显示为倾斜到公里高度。根据初始粒子速度和尺寸，已经识别了定义在月球表面上跳过跳跃的参数化的调节。

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