Sunbow/sundog
Taken by Andrea Mullaney on January 8, 2016 @ Canyon Lake, Texas, USA
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  Camera Used: SONY DSC-HX20V
Exposure Time: 1/640
Aperture: f/13.0
ISO: 100
Date Taken: 2016:01:08 19:40:28
  
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I was amazed to behold this bright and beautiful sundog that appeared just as the sun was setting behind a hill with a flag on top. This was taken from my front yard in Canyon Lake, Texas in Hill Country. The conditions were just right for this amazing spectacle - it was cloudy in the mid 40s during most of the afternoon, but then the clouds disappeared and the sun came out blazing. The temperature rose 20 degrees and a light fog formed across the hills. As soon as the light of the setting sun met the mist - VOILA! A feast for the eyes.
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A corona produced by diffraction of sunlight by small water droplets in fog.
http://www.atoptics.co.uk/droplets/corona.htm

Les - www.atoptics.co.uk
Posted by ato912 2016-01-09 10:36:01
Oh thank you, Les :-) Corona it is! - Andrea
Posted by akcov68 2016-01-09 11:59:54
I live nearby, that corona was likely from all the cedar (Juniper) pollen. It was as thick as a smoke in an Idaho ski valley!!!
Posted by dougr855 2016-01-10 10:35:37
You know what, dougr855 - I think you are absolutely correct! It had been foggy - we had been under a dense fog advisory that day and the day prior into the late mornings because of the temp changes; however, this was an early evening fog - and we were also just covered with Cedar pollen. I think the sunlight filtering through the pollen/moisture mist created that corona - sure enough. Ive seen the sun filter through regular fog before, but it never created a corona image like this so the pollen had to play a role.
Posted by akcov68 2016-01-10 18:21:05
Thats quite correct, a pollen corona. I had no idea that Texas has significant airborne pollen in January ;-).

Les - www.atoptics.co.uk
Posted by ato912 2016-01-14 12:22:57
 
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