There are two primary types of terrain on the Moon: the heavily cratered and very old highlands and the relatively smooth and younger maria. The maria (which comprise about 16% of the Moon's surface) are huge impact craters that were later flooded by molten lava. Most of the surface is covered with regolith, a mixture of fine dust and rocky debris produced by meteor impacts. For some unknown reason, the maria are concentrated on the near side.

With no atmosphere and no magnetic field, the Moon's surface is exposed directly to the solar wind. Over its 4 billion year lifetime many ions from the solar wind have become embedded in the Moon's regolith. Thus samples of regolith returned by the Apollo missions proved valuable in studies of the solar wind.

Originally posted by pieman

Originally posted by getreadyalready
The "Solar Wind" is an energy wind, not an atmospheric one. It does not "move" physical particles, so it cannot be responsible for the dunes.

you might like to explain why comets have tails then.

OP, can you provide sources for you pictures, no offense but we only have your word that those dunes are on the Moon.