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

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 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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