Colorful Light Pillars
Credit & Copyright:
Walter Tape
(Alaska Fairbanks),
Figure 8-1,
Atmospheric Halos
How can an aurora appear so near the ground? Pictured above are not
aurora but nearby
light pillars,
a local phenomenon that can appear as a distant one.
In most places on Earth, a lucky viewer can see a
Sun-pillar, a column of light
appearing to extend up from the
Sun caused by flat fluttering
ice-crystals reflecting sunlight from the upper atmosphere.
Usually these
ice crystals evaporate before reaching the ground.
During freezing temperatures, however,
flat fluttering ice crystals may form near the
ground in a form of light snow, sometimes known as a
crystal fog.
These ice crystals may then reflect ground lights
in columns not unlike a
Sun-pillar.
In the above picture, the colorful lights causing the
light pillars surround a
ice-skating rink in Fairbanks,
Alaska.