sunset in a forest heather landscape with polar stratospheric clouds, a rare weather phenomenon that colors the sky pink

atmosphere atmospheres atmospheric background beautiful civil cloud clouds cloudy colorful colors dawn depletion effect effects forest heather hemisphere holes horizon iridescence landscape moorland mother nacre nacreous northern optics ozon ozone pearl phenomenon phenomenons pink polar psc pscs purple rare season seasonal sky stratosphere stratospheric sundown sunset that trees twilight vibrant vivid weather winter