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Light Pillar and Crepuscular Rays on March 6th, 2010

Light pillars and crepuscular rays are sometimes difficult to tell apart. While light pillars are formed by reflection on ice crystals in a narrow column below and above the light source - also by refraction and reflection in the crystals, crepuscular rays are much more common. They just need any kind of airborne particles like dust, snow flakes, ice crystals, pollen or water droplets to form. Crepuscular rays are columns of sunlit air that seem to diverge because of a perspective effect. In contrast to the light pillars, they need clouds. The air molecules alone already scatter the light.

On the first photo the lower light pillar is quite distinct. On the photo below not only the reddened lower and whitish upper light pillar can be observed, but also crepuscular rays. Cloud shadows are being projected on a layer of haze closer to the observer than the cloud itself. Note how the sunlit cloud rims redden and dim with distance to the position of the sun.


Below: upper and lower light pillar and crepuscular rays on march 6th, 2010.


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