Editing Cosmic ray visual phenomena (section)

===Fluctuations during and across missions===
Apollo astronauts reported that they observed the phenomenon more frequently during the transit to the [[Moon]] than during the return transit to [[Earth]]. Avdeev ''et al.'' (2002) suggested that this might be due to a decrease in sensitivity to the LF over time while in space.<ref name="Avdeev2002" /> Astronauts on other missions reported a change in the rate of occurrence and intensity of the LF during the course of a mission.<ref name="Fuglesand2006" /> While some noted that the rate and intensity increased, others noted a decrease. These changes were said to take place during the first days of a mission. Other astronauts have reported changes in the rate of occurrence of the LF across missions, instead of during a mission. For example, Avdeev himself was on Mir for six months during one mission, six months during the second mission a few years later and twelve months during a third mission a couple of years after. He reported that the LF were seen less frequently with each subsequent flight.<ref name="Avdeev2002" />

Orbital altitude and inclination have also correlated positively with rate of occurrence of the LF. Fuglesang ''et al.'' (2006) have suggested that this trend could be due to the increasing particles fluxes at increasing altitudes and inclinations.<ref name="Fuglesand2006" />