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POPSPersian Clouds - NLC's going south
Spaceweather says: "Noctilucent clouds (NLCs) are supposed to be a high-latitude phenomenon, most often seen in Canada, Russia and northern Europe. On July 19th the electric-blue clouds crept south, all the way to Iran: "I took this picture from Mt. Sabalan, a 15,784 ft extinct volcano in northwestern Iran," says Siamak Sabet. "It is the third highest peak in our extremely mountainous country." When noctilucent clouds first appeared in the late 19th century, they were confined to latitudes above 50o N. Mt Salaban is located at 38o N, far below the old threshold. Just last week, NLCs were sighted in Turkey at 40o N and in recent years they have appeared at least as far south in the United States as Colorado and Utah, also around 40o N. Why are NLCs spreading south? That is an unsolved mystery of these puzzling clouds. Some researchers believe it is a telltale sign of climate change, but this remains controversial. One thing is certain: Sky watchers at all latitudes should be ale
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