sci-universe: A circumhorizontal arc, often called a fire rainbow, is an optical phenomenon in which an ice halo forms by hexagonal, plate-shaped ice crystals in high level cirrus clouds. The halo is so large that the arc appears parallel to the horizon,
sci-universe: A circumhorizontal arc, often called a fire rainbow, is an optical phenomenon in which an ice halo forms by hexagonal, plate-shaped ice crystals in high level cirrus clouds. The halo is so large that the arc appears parallel to the horizon,