论文标题
从月球表面弹出到土超月底系统的灰尘分布
Distribution of dust ejected from the lunar surface into the Earth-Moon system
论文作者
论文摘要
目标。船上的月球尘埃实验在月球周围检测到了不对称的尘埃云，登上月球氛围和灰尘环境探索者任务。我们研究了逃脱月球及其在地球系统中的配置的晶粒的动力学。 方法。我们为排出的灰尘使用合理的初始喷射分布和质量产量。在动力学模型中考虑了各种力，包括太阳辐射压力和月球，地球和太阳的重力，并进行了灰尘颗粒轨迹的直接数值整合。最终状态，平均寿命跨度以及逆行晶粒作为粒径功能的比例。地球系统中的数量密度分布是通过长期模拟获得的。 结果。平均寿命取决于灰尘颗粒的尺寸，并且在$ 1 \，\ mathrm {μm} $和$ 10 \，\ mathrm {μm{μm} $之间的尺寸范围迅速增加。大约$ {3.6 \ times10^{ - 3} \，\ mathrm {kg/s}} $（$ \ sim2 \％$）粒子从月球表面弹出散发出月亮的重力，它们形成了地球的重力$ [10 \，r_ \ mathrm {e}，50 \，r_ \ mathrm {e}] $，它偏向于太阳方向。地球系统中发生了相当数量的逆行颗粒。
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.
