The article was updated after initial publication.
one shown above is not the trail of a chemical sprayed from a plane, but a bow circumorizzontale . According to the 'Astronomy Picture of the Day , which reported this picture taken in Ohio by Todd Sladoje in early May of 2009, the ice crystals in cirrus clouds away act like tiny prisms that refract the sunlight breaks down the colors. The arc
circumorizzontale is a rare phenomenon, because the sun must be at least 58 degrees above the horizon and must be present in cirrus clouds such as hexagonal ice crystals must be aligned predominantly in the horizontal direction.
05/17/2009: Correction
L ' Astronomy Picture of the Day published a correction: initially identified the image as a iridescent cloud, a very common phenomenon of diffraction and refraction occurs when a thin cloud of water droplets of nearly uniform size is illuminated by the sun with the right angle.
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