|Place:||Tübingen, Germany||Observer:||Till Credner|
© Copyright by the observers
Such iridescent clouds appear due to diffraction effects if the clouds water droplets are of similar sizes.
Further images of iridescent clouds
M.G.J. Minnaert: "Light and Color in the Outdoors", Springer-Verlag
R. Greenler: "Rainbows, Halos, and Glories", Cambridge University Press
L. Cowley: "Atmospheric Optics" web site