There is something very familiar about this, of course its the sunline. But wait there is
apparently no atmosphere on the moon. The theory suggesting electrically charged dust causing a sunline is questioned here. Of all EH2r records from a significant database of Earthly sunsets (from polar and temperate zones), none have given a sunline due to dust, it does not happen. Sunlines are a pure atmospheric optical refraction effect.
refraction effect caused a few km away, not through a long distance of atmosphere. But caused by air less than half a meter above the gravel hill. It took very little gaseous molecules to cause this effect.
There was a very faint or negligible corona because there was no dust or ice crystals (it was too warm for crystals to form). There was light winds as well, frozen ground reduced dust levels greatly almost completely.
The absence of dust here contradicted the presumption that sunlines
are caused by dust. They exist because of gas. Until a dust sunline can be replicated, a dust sunline is simply an un-observed theory on Earth.
The actual physics of dust bending light uniformly would be quite exotic, unless unique to the moon, dust scatters light when photons are present. The theory suggesting
that light gets bent, creating a later sunset, indeed introducing focused photons making a layer of the micro horizon bright has nothing to do with particulates.
It is not inconceivable that the moon may have some daily outgassing similar to comets during their celestial orbits approaching the sun. On the lunar surface there is a daily very steep rapid change in temperature, a heat cycle familiar in the Arctic, where micro surface thermal variations are responsible for great photon redirecting. There is also an atmosphere on the moon, said to be very weak, 13 degrees of magnitude weaker than on earth, perhaps not always the same or uniformly everywhere on its surface. WD October 15-16, 2014