$Nacreous Clouds - High altitude Polar Stratospheric Clouds at altitudes of 49,000 - 82,000 feet. They are made of mostly ice crystals. Best observed in Winter at dawn or dusk when, due to curvature of the earth they are illuminated by sunlight from below the horizon and colored interference fringes form due to diffraction.$

nacreous clouds - polar stratospheric clouds

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nacreous clouds high altitude polar stratospheric sky atmosphere atmospheric weather color stratosphere dusk diffraction meteorological meteorology sunlight