Double Solar Halo | Dave Cotterell

Dave Cotterell
Location of photo
Castleton, ON, Canada
Date/Time of photo
2009 03 21, 1:56pm EDT
Canon XSi, 10mm lens f/3.5, ISO 100, 1/1000sec.
Single Solar Halos are fairly common when the sun shines through high thin cloud layers. The second, outer halo is much less commonly seen due to lack of contrast with the clouds and is also more difficult to photograph due to its large angular extent which puts it outside all but the widest lenses. Notice that the 'rainbow' colour effect which can be faintly seen is reversed in the secondary halo due to the double refraction. Also it can be seen that there is more scattered sunlight between the two halos than inside our outside them.
All comments must follow the Sky & Telescope Terms of Use and will be moderated prior to posting. Please be civil in your comments. Sky & Telescope reserves the right to use the comments we receive, in whole or in part, and to use the commenter’s username, in any medium. See also the Terms of Use and Privacy Policy.


This site uses Akismet to reduce spam. Learn how your comment data is processed.