[NLRS] Aurora season begins, NLC season ends

[Bill Smith via NLRS]

Space Weather News for Aug. 31,  2014
http://spaceweather.com  

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.