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A transient lunar phenomenon, or lunar transient phenomenon, is a short-lived light, color, or change in appearance on the surface of the Moon. (Wikipedia)
A TLP is an explosive emanation of waste gases deposited under lunar soil produced by geological lunar activity, possibly originated by a moonquake because of the gravitational pull of the Earth-Moon system. These gases are also influenced by the incident solar radiation wich makes them visible. (Cornell University Library).
Electric Sparks May Alter Evolution of Lunar Soil
August 21, 2014
The moon appears to be a tranquil place, but modeling done by University of New Hampshire (UNH) and NASA scientists suggests that, over the eons, periodic storms of solar energetic particles may have significantly altered the properties of the soil in the moon's coldest craters through the process of sparking—a finding that could change our understanding of the evolution of planetary surfaces in the solar system.
What’s at little less clear are the source of luminous “hazes” or “glows” noted by observers. Keep in mind; we’re talking subtle effects noted after meticulous study. NASA even commissioned a study of TLPs named Project Moon-Blink during the early Apollo program. About a third of TLP events have been observed near the bright crater Aristarchus. Researchers even managed to get Neil Armstrong to make an observation of the crater during a pass on Apollo 11. He noted that “there’s an area that is considerably more illuminated than the surrounding area. It seems to have a slight amount of fluorescence.”
The final conclusion of the BAA study cites that “Although there are theories that might infer that TLP would be more frequent during solar activity, from a sunspot cycle perspective there is no evidence to support this.”