Sometimes, conditions are so perfect that a rare double green flash can be observed. Flat prairies and deserts also tend to have the appropriate conditions for a green flash sighting. Richard Byrd and his crew claimed to have seen a "green sun" persist for 35 minutes while on an expedition to Antarctica in , according to Young. Scientists now believe that there must have been some mirage effect present for the phenomenon to go on for that length of time. Inferior mirage flashes are oval and flat and occur close to sea level when the surface of the water is warmer than the air above it. The brief flash of green light is seen more often at sunset than at sunrise. Mock mirage flashes, on the other hand, occur higher up in the sky and when conditions on the surface are colder than the air above. Subduct flashes are created when the sun appears to form an hourglass shape due to a phenomenon called atmospheric inversion , which occurs when a layer of warm air traps cool air and moisture close to the ground. As such, blue and violet light are scattered by the atmosphere while red, orange and yellow are absorbed, leaving the green light the most visible during the few seconds when the sun sets below or rises above the horizon.
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