{"id":805,"date":"2007-03-18T20:03:23","date_gmt":"2007-03-18T20:03:23","guid":{"rendered":"http:\/\/www.permuted.org.uk\/photography\/archives\/805"},"modified":"2013-11-27T00:20:23","modified_gmt":"2013-11-27T00:20:23","slug":"sun-dog-perhelia","status":"publish","type":"post","link":"https:\/\/www.permuted.org.uk\/photography\/sun-dog-perhelia\/","title":{"rendered":"Sun Dog (parhelia)"},"content":{"rendered":"<\/p>\n

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Meet the Sun Dog. Not one of our four-legged friends, but an ice rainbow. The technical term for these is 'parhelia'. They are more common in arctic regions (which is something of a warning for the weather this week… brrrr), and occur where the edge of the sun's 22 degree halo meets ice crystals. These refract the light and cause the rainbow effect even though there's not a drop of rain in sight. A proper technical explanation can be found at the Hyperphysics<\/a> site <\/p>\n

Apparently they are easier to spot when the sun is low in the sky, and you have to be facing towards the sun to see them so they can be difficult to see if it's too bright. Fortunately they are some way off the direct line of sunlight, so you aren't risking your eyesight in photographing them if you do see one. I was facing west (as you would be at the end of the day), and the Sun Dog appeared some distance to the south (left) of the sun. <\/p>\n

Sun Dog's aren't that uncommon, so I presume I must have seen one before but just not noticed it as anything special. So I'm claiming this as a personal first. Scanning the sky with the camera has made me much more aware of the conditions around me (especially light) so it's great to see something new. By the way, on the subject of light: I hate grey dull days (no contrast and slow shutter speeds). I like the early morning and late afternoon sun (great for under-lighting birds in flight). I'm not keen on very harsh bright days (too much contrast). <\/p>\n

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