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Time-Lapse: Northern Lights and Noctilucent Clouds

June 11, 2013

The Amazing Sky

Northern Lights and Noctilucent Clouds (135mm #1) (June 9, 2013)

What strange clouds these are, moving where there shouldn’t be winds, and forming where there’s barely any air.

These are noctilucent clouds, sometimes called polar mesospheric clouds. Their icy strands form around particles at the top of the atmosphere some 80 km up. There’s almost no air up there so just how these clouds form has always been a mystery. They may be condensing around meteoric dust particles. They may also be more common now than in past decades and centuries, as the upper atmosphere cools due to an odd quirk of global warming that sees the lower troposphere warm while the upper mesosphere cools.

This was the first display of NLCs I’ve seen so far this season. They can only be seen, and indeed they only form, in summer. Sunlight streams over the pole and lights these clouds all night long. They are literally “night-shining” clouds. Only from a…

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