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Solar Halo, check your skies today! 1st April 2007

2 Responses to “Solar Halo, check your skies today!”

  1. 1
    Darren Squashic:

    I\'ve tried taking photos of this when I\'ve seen it in the past and my 17mm on my 20D was never wide enough. I guess I need a 15mm!

  2. 2

    Yeh , sure :-)
    Nice photo anyway…..

  • Canon EOS 20D
  • 0.000 s (1/4000) (1/4000)
  • f/13.0
  • aperture priority (semi-auto)
  • 200
  • 2005:12:17 21:20:11
  • matrix
  • 15.00 (15/1)
  • Auto Exposure
Solar Halo, check your skies today!

The story behind "Solar Halo, check your skies today!"

From this site
“The solar halo is an atmospheric optical phenomenon that can be seen unexpectedly frequently for example when the weather is changing for the worse. The halo has a radius of about 22 degrees, and sometimes it’s called “inner halo” or “22 degrees-halo”. When the hexagonal ice crystals are distributed at random in higher sky, the refracting angle of sunlight that enters and exits the side planes of the crystal is equivalent to about 22 degrees. Because ice crystals are facing various directions and floating in the sky, we can observe the refracted sunlight as a circle of light with a radius of 22 degrees.”

Actually today this phenomenon should be visible in most of the Northern hemisphere due to an expected receding high cold front causing cristallisation! Due to the different timezones and the turning of the earth, it should be visible everywhere between 15.00 & 16.00 local time, it does not matter if it is cloudy or not. Let me know what you saw, but never look directly in the sun, cover it with your hand or look through a negative (‘mummy, what is a negative?’ ;-).

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