Light Pillars
Taken by Patrik Holmström on January 19, 2013 @
Örsundsbro, Uppland, Sweden
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Camera Used: Canon Canon EOS 600D
Exposure Time: 16/10
Aperture: f/2.8
ISO: 800
Date Taken: 2013:01:19 05:59:09
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Details:
This was the sight that greeted us at the nearby small town of Örsundsbro in southern Sweden as we made our way back early Saturday morning (04.26) from the Uppsala Amateur Astronomy (www.uaa.nu) observatory. During the night the temperature dropped from -10 to about -25 degrees Celcius as a weather front moved in. After a some hours of clear skies this weather front started creating ice crystals that caused both a haze that covered the entire sky and a glittering ground level fog that together made further observations and tests fruitless so we quit for the night.
We were however treated to this display on our way home, that was even grander in person. The crystals however disappear soon after we left Örsundsbro so we couldnt try our luck closer to the larger town of Uppsala.
A quick Internet search before bed suggests that light pillars occurs when ice crystals form that has horizontal faces that reflects light sources back towards the line of sight of the observer.
Image was captured (1,6 sec, F2.8, ISO800) from the side of the road with my Canon 600D and Sigma 24-70mm F2.8 IF EX USM DG resting on the car roof.
best wishes
Patrik Holmström
Uppsala AmateurAstronomers, Sweden
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