* Astronomy

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RE: Noctilucent Clouds

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Date: 3rd July, 2011

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Noctilucent Clouds

Credit Nick Bramhall

3rd July 2011, over Westburn Park, Aberdeen

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Date: 01:15 GMT, 3rd June, 2011

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High up in the sky near the poles some 50 miles above the ground, silvery blue clouds sometimes appear, shining brightly in the night. First noticed in 1885, these clouds are known as noctilucent, or "night shining," clouds. Their discovery spawned over a century of research into what conditions causes them to form and vary - questions that still tantalize scientists to this day. Since 2007, a NASA mission called Aeronomy of Ice in the Mesosphere (AIM) has shown that the cloud formation is changing year to year, a process they believe is intimately tied to the weather and climate of the whole globe.
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Each summer, high in the night skies of the far northern and southern hemispheres a unique phenonmenon occurs - noctilucent clouds. Little is known about them, but now an amateur astronomer from north Wales is trying to predict when they are likely to appear.
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Date: 02:15 GMT, 5th July, 2010