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۱۳۹۱ آذر ۲۹, چهارشنبه



2012 December 18 
See Explanation.  Clicking on the picture will download 
the highest resolution version available.
A Sun Pillar Over Sweden 
Image Credit & Copyright: Göran Strand
Explanation: Have you ever seen a sun pillar? When the air is cold and the Sun is rising or setting, falling ice crystals can reflect sunlight and create an unusual column of light. Ice sometimes forms flat, six-sided shaped crystals as it falls from high-level cloudsAir resistance causes these crystals to lie nearly flat much of the time as they flutter to the ground. Sunlight reflects off crystals that are properly aligned, creating the sun-pillar effect. In the above picture taken last week, a sun-pillar reflects light from a Sun setting over ÖstersundSweden.