[MIham] Night-Shining Clouds Sighted over Europe

[Frank]

Space Weather News for June 7, 2007
http://spaceweather.com

NIGHT-SHINING CLOUDS: Last night a vivid display of electric-blue
noctilucent clouds (NLCs) appeared over parts of northern Europe, signaling
the start of the 2007 NLC season.  Noctilucent or "night-shining" clouds
were first reported in the 19th century after the eruption of super-volcano
Krakatoa.  In those days, NLCs were confined mainly to high latitudes, but
they have intensified and spread with sightings in recent years as far south
as Utah and Colorado. The origin of these clouds is a mystery; they may be a
side-effect of global warming. A NASA spacecraft named AIM is in orbit now
to investigate.

The peak observing season for NLCs is late spring and early summer. For the
next two months, northern sky watchers should be alert for silvery tendrils
spreading across the western sky after sunset.  High-latitudes (Canada,
northern Europe, Alaska) are favored, but NLCs are capable of descending
unknown distances south, so it pays to be alert no matter where you live.
Visit spaceweather.com for pictures and observing tips.

BONUS BANG:  Sunspot 960 remains big and active this week.  Today's edition
of http://spaceweather.com features a movie of the sunspot erupting.  It's a
must-see.
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