Green flash | 台北市立動物園資訊網

Thegreenflashandgreenrayaremeteorologicalopticalphenomenathatsometimesoccurtransientlyaroundthemomentofsunsetorsunrise.Whenthe ...

Meteorological optical phenomenon

The green flash and green ray are meteorological optical phenomena that sometimes occur transiently around the moment of sunset or sunrise. When the conditions are right, a distinct green spot is briefly visible above the Suns upper limb; the green appearance usually lasts for no more than two seconds. Rarely, the green flash can resemble a green ray shooting up from the sunset or sunrise point.

Green flashes occur because the Earths atmosphere can cause the light from the Sun to separate, or refract, into different colors. Green flashes are a group of similar phenomena that stem from slightly different causes, and therefore, some types of green flashes are more common than others.[1]

Green flashes may be observed from any altitude. They us...