Polar Stratospheric (Nacreous) Cloud

JFDee

Senior Member.
A fresh photo was published on http://www.spaceweather.com/

Marcus-Ahlund-F94A6531_1451356764.jpg

Here is the explanation from the portal page:

Further discussion about this type of cloud can be found in this Metabunk thread.

As a side remark, recent solar activity may spark off aurora displays even at lower latitudes during the next hours.
 
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