Nacreous Clouds in Iceland (4K)

Описание: The Nacreous clouds or Polar Stratospheric clouds (PSC) are a rare phenomena only visible in the mid winter in the polar regions. They are formed like any other clouds, but at very high altitudes, 15,000 - 25,000 meters (49,000-82,000 ft) and get the rainbow like colours when the sun hits them before rising above the horizon. The ice crystals in these clouds are hit by the light of the rising sun at dawn, when it is 1-6 degrees below the horizon at civil twilight. PSC are formed at very low temperatures, below -78 degrees Celsius (-108 deg. F) and even though the stratosphere is very dry the clouds may form when the conditions are right. The main type of PSC is made up of supercooled water droplets and nitric acid and has been linked to formation of ozone holes. The other type is made of ice crystals only and is not harmful to the atmosphere.

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