Noun
green flash (plural green flashes)
(meteorology, astronomy) A rare phenomenon observed in morning or evening when the sun is crossing or immediately below the horizon, in which a momentary flash or ray of green light appears above the upper rim of the solar disk, caused by refraction of light in the atmosphere.
A green flash was added to the socks, which from 1938 became a green turnover (although on blue socks thus eliminating red from the kit), and that has remained a feature of the strip ever since. Source: Internet
A green flash is more likely to be seen in stable, clear air, when more of the light from the setting sun reaches the observer without being scattered. Source: Internet
If the atmosphere is layered the green flash may appear as a series of flashes. Source: Internet
Often a green rim changes to a green flash and back again during the same sunset. Source: Internet
The following quote describes what was probably the longest observation of a green rim, which at times could have been a green flash. Source: Internet
The second inset frame is the Farallon Islands with a green flash on the left-hand side. Source: Internet