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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Levitation of charged dust grains and its implications in lunar environment
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Levitation of charged dust grains and its implications in lunar environment

机译：带电尘埃的悬浮及其对月球环境的影响

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The surfaces of airless, non-magnetized bodies like the Moon are directly exposed to solar wind and ultraviolet radiation, causing surface dust grains to be electrically charged and levitated, whenever electric fields exceed the surface forces and gravity. For an improved understanding of the lunar dust environment, we study the surface charging processes using electrostatic modelling and present the results here. We apply Gauss's law to examine the dust levitation and compare the implications with those obtained using free-space capacitance of the particle. Calculating grain charge on surface by assuming its free-space capacitance is erroneous and is therefore inapplicable. The daytime surface potential during high solar activity is estimated to be similar to 20 V, while the nighttime potential can be as high as -3.8 kV. The maximum radius of levitating particles is greatly affected by the method used to model the dust levitation. Using Gauss's approach, it comes out to be in the picometre range near the terminator, in contrast to existing calculations which estimate it to be in the nanometre to micrometer range. The LDEX provided no indication of 0.1. m-sized particles near the terminator, as suggested previously from Apollo observations. This result is not inconsistent with our predictions based on Gauss's law. Hence, it still remains an open question whether dust levitation occurs on the Moon or not, and experiments are necessary on future lunar lander mission which provide direct measurement of surface potential and near-surface charged dust particles to confirm the same.
机译：当电场超过表面力和重力时，无空气，无磁化的物体（如月球）的表面直接暴露于太阳风和紫外线辐射下，使表面的尘埃颗粒带电并悬浮。为了更好地了解月球尘埃环境，我们使用静电建模研究了表面充电过程，并在此处介绍了结果。我们应用高斯定律检查粉尘悬浮，并将其影响与使用粒子自由空间电容获得的影响进行比较。通过假定其自由空间电容来计算表面上的谷物电荷是错误的，因此不适用。在高太阳活动期间，白天的表面电势估计约为20 V，而夜间的电势可能高达-3.8 kV。悬浮颗粒的最大半径受粉尘悬浮模型的影响很大。使用高斯的方法，得出的结果是在终止子附近的皮米范围内，而现有的计算估计它在纳米到微米范围内。 LDEX未提供0.1的指示。如先前从阿波罗观测中所暗示的，终结子附近有m个大小的粒子。这个结果与我们基于高斯定律的预测并不矛盾。因此，在月球上是否发生尘埃悬浮仍然是一个悬而未决的问题，而且对未来的月球着陆任务有必要进行实验，这些实验可以直接测量表面电势和近地带电尘埃颗粒，以确认它们。

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