Location of photoCastleton, ON, Canada
Date/Time of photo2009 03 21, 1:56pm EDT
EquipmentCanon XSi, 10mm lens f/3.5, ISO 100, 1/1000sec.
DescriptionSingle 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.