Analysis on electrostatic levitation of lunar dust on the Moon's light side
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摘要: 基于单粒子轨道理论及空间尘埃等离子体充电方程,建立了月球受光面上尘埃微粒的静态荷电模型.基于光电子能量Maxiwellian分布假设,确定了月面垂直空间电场强度和光电子鞘层内带电粒子密度的函数表达式.利用牛顿运动定律和静电场力表达式,构建了月球受光面上尘埃微粒的静电浮扬动力学模型,并进行月尘静态浮扬特性的数值计算.研究结果显示:太阳高度角与颗粒粒径是控制月尘静电浮扬发生及动力学特性的两个基本参量;月尘静电浮扬发生在月球的黎明和黄昏;随着粒径的减少,月尘颗粒的最大浮扬高度不断增加.Abstract: The electrostatic charging process of lunar dust particulate on the moon-s light side was modeled based on particle orbit theory and charging equation of space dusty plasma. Assuming a Maxiwellian distribution of photoelectron energies, the formulae of strength of vertical electric field as well as photoelectron density in a photoelectron sheath were derived. By means of the Newton-s law of motion and electrostatic force equation, the dynamic model of electrostatic levitation for lunar dust grain on the moon-s light side was derived. The dynamic behavior of levitating dust grain on the moon-s light side was numerically analyzed. The results show that the basic controlling parameters for the onset of levitation and dynamics of the levitating particulate are the solar elevation angle and dust grain radius. The electrostatic levitation of lunar dust occurs during sunset and sunrise above the lunar surface. The smaller the dust grain size, the higher the vertical displacement of dust grain due to electrostatic levitation on the same environmental condition.
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