A circumhorizontal arc is when an ice-halo is formed by plate-shaped ice crystals in cirrus clouds. The misleading term fire rainbow is sometimes used to describe them. But they are neither rainbows or related to fire. The name comes because it appears to be a rainbow taking the shape of flames in the sky. (Source)
linse via 
greenka2000
panimruk
lazhward
mountaingirl
poliszurek
hormeza
sisterhood
zzuuoo
psychedelics
verschwoerer
brystol
melomanka
cortunia
majkey
rainingman
malikor
rubinek
elentarie
absolem