Sunday, August 31, 2014

Aurora season begins, NLC season ends

Source - Space Weather News for Aug. 31, 2014:

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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