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Polar Stratospheric Clouds
An anomalous red glow due to scattered sunlight was observed at Longyearbyen (78 • N, 15 • E) on 6 December 2002 from 07:30 UT to 13:30 UT when the solar zenith angle varied between 100.7 • and 104 • . A model for this red sky event using sunlight scattered in a two stage process by Polar Stratospheric Clouds (PSC) at 25 km is presented and demonstrated to be feasible. The model requires a significant fraction of the polar vortex, which is cold enough for the formation of ice PSC, to bedoi:10.1126/science.283.5404.901f fatcat:jqg2ehez7zamffhwzae3nsf7fa