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A flame rainbow, also known as a circumhorizontal arc, is a rare optical phenomenon that occurs in the Earth’s atmosphere. It is a type of ice halo that presents itself as a horizontal rainbow or band of colors in the sky. The term “flame rainbow” is a misnomer, as this optical phenomenon has nothing to do with either flames or rainbows.

A flame rainbow occurs when the sun is high in the sky, and its light passes through hexagonal ice crystals in cirrus clouds. As light enters the crystal, it refracts and splits into its various colors, forming the band of colors seen in flame rainbows. The colors of the flame rainbow are arranged in the same order as a regular rainbow – red, orange, yellow, green, blue, indigo, and violet – but they appear horizontally rather than in a curve.

Flame rainbows are most commonly spotted during the summer months in the mid-latitudes. To see a flame rainbow, one must be in the right place at the right time. The sun has to be high enough in the sky for the light to pass through the ice crystals and create the optical phenomenon.

Flame rainbows can be easy to miss, as they often occur far away from the sun and are only visible for a short period of time. They are also often mistaken for other optical phenomena, such as fire rainbows, sundogs, or halos.

flame rainbows are a rare and stunning optical phenomenon that occur when sunlight passes through hexagonal ice crystals in cirrus clouds. They are a sight to behold and can be most commonly seen during the summer months in the mid-latitudes. Although they may be easy to miss or mistake for other optical phenomena, spotting a flame rainbow is a unique and awe-inspiring experience.