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Noctilucent cloud




Noctilucent cloud - July - Haworth


Noctilucent cloud

Noctilucent clouds are made of very thin layers of crystals of water ice, collecting on the surface of dust particles. They are higher than any other clouds, located 30 - 50 miles high up in the atmosphere.

They are illuminated by the sun after it has set below the horizon when the lower layers of the atmosphere are in Earth's shadow.

They usually occur in the summer months. The name Noctilucent is Latin for night shining

Noctilucent clouds photographed at Haworth on 12 July 2009




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