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arXiv 2204.01040astro-ph.EPphysics.space-ph
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从月球表面喷射到地月系统的尘埃分布

Distribution of dust ejected from the lunar surface into the Earth-Moon system

Kun Yang, Jürgen Schmidt, Weiming Feng, Xiaodong Liu

摘要:

目标。月球大气和尘埃环境探测器飞行任务上的月球尘埃实验探测到月球周围有一个不对称的尘埃云。我们研究了地月系统中逃逸出月球的颗粒的动力学及其构型。方法.我们使用一个合理的初始喷出物分布和大规模生产率喷出的尘埃。在动力学模型中考虑了太阳辐射压力和月球、地球和太阳的引力等各种力,并对尘埃粒子的运动轨迹进行了直接的数值积分。最终状态,平均寿命跨度,和逆行颗粒的分数作为粒子尺寸的函数进行计算。通过长期模拟得到了地月系统中的数密度分布。结果平均寿命取决于尘埃颗粒的大小,在$1\, \mathrm{μm}$和$10\, \mathrm{μm}$之间的大小范围内,平均寿命迅速增加。关于${3.6\times10^{-3}\,\mathrm{kg/s}}$($\sim2\%$)从月球表面喷射出的粒子逃脱了月球的引力,它们在地球和月球之间形成了一个在$[10\,R_\mathrm{E},50\,R_\mathrm{E}]$范围内的非对称环面,该环面向太阳方向偏移。地月系统中有相当数量的逆行粒子。

英文摘要:

Aims. An asymmetric dust cloud was detected around the Moon by the Lunar Dust Experiment on board the Lunar Atmosphere and Dust Environment Explorer mission. We investigate the dynamics of the grains that escape the Moon and their configuration in the Earth-Moon system. Methods. We use a plausible initial ejecta distribution and mass production rate for the ejected dust. Various forces, including the solar radiation pressure and the gravity of the Moon, Earth, and Sun, are considered in the dynamical model, and direct numerical integrations of trajectories of dust particles are performed. The final states, the average life spans, and the fraction of retrograde grains as functions of particle size are computed. The number density distribution in the Earth-Moon system is obtained through long-term simulations. Results. The average life spans depend on the size of dust particles and show a rapid increase in the size range between $1\, \mathrm{μm}$ and $10\, \mathrm{μm}$. About ${3.6\times10^{-3}\,\mathrm{kg/s}}$ ($\sim2\%$) particles ejected from the lunar surface escape the gravity of the Moon, and they form an asymmetric torus between the Earth and the Moon in the range $[10\,R_\mathrm{E},50\,R_\mathrm{E}]$, which is offset toward the direction of the Sun. A considerable number of retrograde particles occur in the Earth-Moon system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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