Try increasing gamma if dark sections aren't distinguished

Try increasing gamma if dark sections aren't distinguished

Sunday, January 14, 2018

Sunday Sundogs and a pillar

saw a pair of Sundogs while running in the back bay today.  pointed them out to everyone i passed.  most thought i was crazy, but one couple shouted a "thank you" after they found it.



Sundogs 1/14/18



Sundogs are caused by light refracting off hexagonal ice crystals.  if they are random a halo is formed, if they are horizontal, two spots are seen on either side.  Here's a nice explanation.  

Here's a phenomenal example of a double solar halo with sunddogs taken from a ski slope in sweden:

speaking of solar images, here's an Ha image of a "straight pillar"--a form of solar prominence:


Image details:
sundogs:
cellphone Droid turbo
Eastbluff, CA 1/14/18
Ha:
Lunt 60 PT 
ASI 290 MM camera
20 second video 183 fps
Shutter=5.0 ms
Eastbluff, CA 1/4/18

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