Editing Cosmic ray visual phenomena (section)

===Frequency during missions===
On Lunar missions, once their eyes became [[Dark adaptation|adapted to the dark]], Apollo astronauts reported seeing this phenomenon once every 2.9 minutes on average.

On other space missions, astronauts reported perceiving the LF once every 6.8 minutes on average.<ref name="Fuglesand2006" /> The LF were reported to be seen primarily before the astronauts slept and in some cases disrupted sleep, as in the case of Linenger. Some astronauts pointed out that the LF were seemingly perceived more frequently as long as they were perceived at least once before and attention was directed to the perception of them. One astronaut,<ref name="Avdeev2002">{{cite journal |title=Eye light flashes on the Mir space station |journal=Acta Astronautica |first1=S. |last1=Avdeev |first2=V. |last2=Bidoli |first3=M. |last3=Casolino |first4=E. |last4=De Grandis |first5=G. |last5=Furano |first6=A. |last6=Morselli |first7=L. |last7=Narici |first8=M. P. |last8=De Pascale |first9=P. |last9=Picozza |first10=E. |last10=Reali |first11=R. |last11=Sparvoli |first12=M. |last12=Boezio |first13=P. |last13=Carlson |first14=W. |last14=Bonvicinim |first15=A. |last15=Vacchi |first16=N. |last16=Zampa |first17=G. |last17=Castellini |first18=C. |last18=Fuglesang |first19=A. |last19=Galper |first20=A. |last20=Khodarovich |first21=Y. |last21=Ozerov |first22=A. |last22=Popov |first23=N. |last23=Vavilov |first24=G. |last24=Mazzenga |first25=M. |last25=Ricci |first26=W. G. |last26=Sannita |first27=P. |last27=Spillantini |display-authors=5 |volume=50 |issue=8 |pages=511–525 |date=April 2002 |doi=10.1016/S0094-5765(01)00190-4 |pmid=11962526|bibcode=2002AcAau..50..511A }}</ref> on his first flight, only took note of the LF after being told to look out for them. These reports are not surprising considering that the LF may not stand out clearly from the background.