Fascinating spectacle for the Tokyoites Thursday June 26. A multicolored flame appeared in the sky above the Japanese capital. The classic rainbow is linked to the spectrum of white light, here that of the sun. By refracting on the raindrops, the ray is broken down into different wavelengths characterized by seven colors visible to humans.
But the “rainbow of fire” observed at the end of June in Japan is a rarer phenomenon. Also called “rainbow cloud”, or “circumhorizontal arc”, it occurs when light refracts on the ice crystals that form clouds, says Cnews , and only in latitudes between 55 ° south and 55 ° north. Hence their rarity: in Europe, they only appear on average 0.10 times a year.