Polar Stratospheric Clouds
Taken by Harlan Thomas on February 7, 2016 @ Calgary Alberta
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  Camera Used: Canon Canon PowerShot SX50 HS
Exposure Time: 1/2000
Aperture: f/8.0
ISO: 80
Date Taken: 2016:02:07 21:44:09
  
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These are the first that I have seen of these in Calgary.
Photographer's website:
No URL provided.
Comments
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Iridescent clouds occure rarely in the stratosphere (Type II PSCs) and much more often in the troposphere. This page:
http://www.atoptics.co.uk/fz1074.htm
highlights their differences. The picture shows tropospheric clouds.
Les - www.atoptics.co.uk
Posted by ato912 2016-02-08 02:42:42
Another comparison of PSCs and lower level iridescence here:

http://www.atoptics.co.uk/fz853.htm
Posted by ato912 2016-02-08 03:01:46
 
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