[MIham] Summer Solstice Brings Glow-in-the-Dark Clouds

[FSK]

Space Weather News for June 20, 2008
http://spaceweather.com

SUMMER SOLSTICE: Northern summer and southern winter begin today, June 20th,
at precisely 23:59 UT (7:59 pm EDT) when the sun ascends to its highest
latitude on the celestial sphere. In the Northern Hemisphere, we have the
longest day and shortest night of the year, and the reverse in the Southern
Hemisphere. The seasons are changing--Happy Solstice!

NOCTILUCENT CLOUDS: Summer is the season for noctilucent clouds and this
morning, right on cue, a wave of bright NLCs rolled over the British Isles.
Observers in Scotland and Northern Ireland report luminous tendrils of
electric blue bright enough to attract the attention of casual passersby.
These glow-in-the-dark clouds are a 100+ year old mystery under
investigation now by NASA's AIM spacecraft. Originally confined to arctic
latitudes, NLCs have spread in recent years with sightings in the United
States as far south as Utah and Colorado. Check today's edition of
http://spaceweather.com for observing tips and the latest photos.
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