|Date:||3.1.2006, 20:57 UT||Optics:||f=20mm, f/4|
|Place:||Tschierv, Switzerland||Observer:||Till Credner|
© Copyright by the observers
"Scotty, beam me up!". No, the above scene isn't from a science fiction movie. Bright city lights were reflected by floating snow crystals in the air. In spite of a clear starry night, the air was filled with snow. If most ice surfaces of the snow crystals are aligned more or less horizontally, this leads to a light pillar above the light source.
M.G.J. Minnaert: "Light and Color in the Outdoors", Springer-Verlag
Les Cowley: Atmospheric Optics web site about light pillars