Space Weather

Aurora season is now fully underway around the Arctic circle.  With the end of
northern summer approaching, dancing green lights are beaming through the
deepening polar twilight on a regular basis. Unlike lower latitudes, the Arctic
does not require a full-fledged geomagnetic storm for aurora sightings.  Check
the latest images on the front page of http://spaceweather.com

Meanwhile, another polar phenomenon is on the wane: noctilucent clouds (NLCs).
Data from NASA’s AIM spacecraft suggest that the northern summer season for NLCs
ended on or about August 26th.  The “noctilucent daisy” shown on
http://spaceweather.com will probably remain blank until November, when NLC
activity shifts to the southern hemisphere.  NLCs are a summertime phenomenon
and they switch back and forth between the hemispheres accordingly.  Stay tuned
for more electric blue … in a few months.

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