These two types of ice crystals are responsible for the halo displays. Generally the plate crystals fall face down like leaves.
On the other hand, column crystals drift downwards with their long axes nearly horizontal. Regardless of their overall proportions, all the crystals have identical interfacial angles. It is this constancy which gives regular and predictable halos.
Les Cowley and Michael Schroeder provide a halo simulation program on their excellent halo webpage. The following simulation of the halo display on Feb. 14th is done with their program.
The halo on February 13th 2003.
The halo on February 14th 2003.
The halo on February 14th 2003.Check out this exellent halo webpage and Atlas of Halo Forms with graphics and explanations.
Navigation 1
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