They are formed from small water droplets of near uniform size. When the sun is properly positioned, mostly behind thick clouds, these thin clouds almost coherently diffract sunlight, and as a rainbow, different wavelengths are diffracted different amounts. Thus the colors hit the observer from different directions.
According to Wiki: A phenomenon (Greek: φαινόμενoν, pl. phenomena φαινόμενα) is any occurrence that is observable. In popular usage, a phenomenon often refers to an extraordinary event.
Monday, May 14, 2012
Phenomena possibly "Cloud Iridesence"