Cloud iridescence is a type of photometeor, which is a term used to describe atmospheric optical phenomena caused by the scattering, absorption, or reflection of light. It occurs when the sunlight is diffracted or scattered by the water droplets or ice crystals in the cloud, causing the colors to spread out and become visible.
This phenomenon is most often observed in altocumulus, cirrocumulus, lenticular, and cirrus clouds. These clouds are usually composed of tiny water droplets or ice crystals, which can cause the light to refract and diffract, resulting in a rainbow-like display of colors.
Cloud iridescence can sometimes appear as bands that are parallel to the edge of the clouds. These bands can be quite striking and can create a dramatic effect in the sky. The colors seen in the clouds can range from pastel pinks, blues, and greens to more vibrant oranges and purples.
In addition to being observed in the more common clouds, cloud iridescence is also seen in the much rarer polar stratospheric clouds, also known as nacreous clouds. These clouds form in the polar stratosphere and are composed of ice crystals. They are among the highest clouds in the Earth's atmosphere, and they can create some of the most spectacular displays of iridescence in the sky.
Cloud iridescence is a truly remarkable natural phenomenon that is both beautiful and fascinating. It serves as a reminder of the intricate and complex workings of our atmosphere and the amazing visual displays that can result from even the simplest of physical processes. If you ever have the opportunity to witness cloud iridescence in person, be sure to take a moment to appreciate the awe-inspiring beauty of this stunning natural phenomenon.