Polar stratospheric clouds appear high in the sky in the polar regions in winter. Photos in Iceland. Photos by @ h0rdur c/o Fabulous Weird They are composed of ice crystals and supercooled water droplets, sometimes mixed with nitric acid. Wikipedia says : “Particles within the optically thin clouds cause colored interference fringes by diffraction.” The visibility of the colors may be enhanced with a polarising filter .” —- Thanks, Atlas Obscura and Fabulous Weird
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