11 January, 1999
min. -28.4 F
max. -21.7 F
Wind Chill -35
Today at Pole we were treated to a most spectacular display in the atmosphere. The sun shone through a shower of ice crystals that rained down from the clouds above to produce a combination of sun halos, sun dogs (the Fins call them side suns) arcs and circles that is believed to have never occurred simultaneously before.
Two of the nicest people at Pole, Marko Riikonen and Jarmo Moilanen, both of Finland, just happen to be two of the best authorities on the formation of the phenomena we witnessed in the sky this afternoon. They explained that the shapes of the falling ice crystals, as well
as their orientation to the sun's light as they fall, create the different effects that we see.
CRYSTAL SHAPE VISUAL PHENOMENA
Plate Sun dogs, Circles, Circumzenith arcs
Single Oriented Tangent arcs,
Column Infralateral arcs, Anthelic arcs
Double Oriented Parry arcs, Tape's arcs,
Column Hastings arcs, Parhelic circles, subanthelic arcs
Equidimensional 22 degree, 46 degree Randomly Oriented Halos
Pyramidal Multiple Halos
The effects that were seen in the sky at Pole were simulated in a labeled drawing by Jarmo and are included with the pictures below. Please also visit his website for additional information on this magnificent display at http://www.netppl.fi/~jarmom/index.htm
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