Bilateral Sun Dogs

Bilateral sun dogs in Plover, Wisconsin

Bilateral sundogs in Plover, Wisconsin

Sundogs can appear as a colored patch of light to the left or right of the sun, 22° distant and at the same distance above the horizon as the sun, typically in ice halos. The ‘dogs’ in this image have red colors towards the sun with greens and blues beyond.  This is the same sequence of colors seen in rainbows.

Like sun pillars, this atmospheric phenomenon is due to ice crystals. Where as sun pillars owe their existence to plate like crystals, sundogs are due to light reflecting through hexagonal crystals.  If the crystals are oriented with their flat faces horizontal, a sundog is observed. If the hexagonal crystals are randomly oriented, a halo  is formed.

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One Response to “Bilateral Sun Dogs”

  1. 22° Halo | MD Leader Says:

    […] Uniquely Wisconsin Photographs, Thoughts Regarding Physician Leadership and Electronic Health Records « Bilateral Sun Dogs […]

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