Extreme weather conditions have produced a rare cloud formation over Australia's Mawson station in Antarctica.
Meteorological officer Renae Baker captured spectacular images of the nacreous clouds, otherwise known as polar stratospheric clouds, late last month.
Reflecting like an airborne mother-of-pearl shell, the cloud colours are produced when fading light at sunset passes through water-ice crystals blown along a strong jet of stratospheric air more than 10 kilometres above the ground....
http://www.smh.com.au/news/science/extreme-weather-makes-rare-cloud/2006/08/01/1154198117951.html
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