Dawn Sun Pillar ~ Nancy Smith caught this sunrise pillar over Ottawa, Ontario, Canada on October 20th. ©Nancy Smith
Myriad plate-like ice crystals glint the sun towards the eye. Collectively the reflections appear as a pillar.

The crystals have to wobble to produce the elongated halo shape. The greater wobble the taller the pillar.  In clouds, large imperfect crystals tending to snowflake shapes wobble most and make the best pillars.

Even brighter pillars appear in cold weather when low level crystals - diamond dust - glint the sun.


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