[MIham] Electric-blue Clouds Spotted over the Arctic Circle

[Frank]

> Space Weather News for May 22, 2015
> http://spaceweather.com
>
> NOCTILUCENT CLOUDS: NASA's AIM spacecraft has spotted a luminous patch of electric-blue drifting across the Arctic Circle. The sighting marks the beginning of the 2015 season for northern-hemisphere noctilucent clouds (NLCs). Long ago, NLCs were a polar phenomenon confined mainly to the Arctic. In recent years, however, they have intensified and spread, with sightings as far south as Utah and Colorado.  Learn more about these exotic clouds and how you might see them this summer on today's edition ofhttp://spaceweather.com.

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