A beautiful Sun Pillar over Sweden. 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. In the above picture taken last week, a sun-pillar reflects light from a Sun setting over Östersund, Sweden. Image © Göran Strand Used with permission.
A sun pillar or solar pillar is a visual phenomenon created by the reflection of light from ice crystals with near horizontal parallel planar surfaces.