ИСТИНА

Origin of an appearance of two dusty plasma clouds as a result of a meteoroid impact onto the Moon is considered. It is shown that the first of the clouds is formed by particles (or debris) of lunar regolith ejected from the lunar surface by shock wave of meteoroid impact, while the second one is collected by solidified drops of melt. Calculations of basic characteristics of these clouds are performed including the speeds of expansion of the clouds, characteristic sizes of particles in each of the clouds, number densities of the particles, their charges, etc. Qualitative agreement of the calculated speeds of cloud expansion with observational data is shown.