A fire rainbow is an extremely rare phenomenon that occurs only when the sun is high allowing its light to pass through high-altitude cirrus clouds with a high content of ice crystals.

• 火焰彩虹是极为罕见的景象，只有太阳处于天顶，太阳光穿射过高海拔处的卷云，并且卷云富含冰晶时，火焰彩虹才有可能产生。