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This paper presents experimental research to determine the charge of individual dust grains on a lunar regolith simulant surface immersed in plasma. The results show that, at similar surface charging potentials, both the charge and the charge-to-mass ratio of dust grains on a JSC-1A lunar regolith simulant surface is about two orders of magnitude smaller than that of a single, isolated dust particle.
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Ding et al. (2013) studied this question.
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