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   Infralateral Arc  

Don Gent
captured these colourful halos at Merritt, B.C. Canada on June 11, '99 when the sun was 63� high.

Curving over the hills is very possibly a rare infralateral arc.

When the sun is high the infralateral arc curves right underneath it and follows a course very similar to the circumhorizon arc produced by oriented plates. However, here the infralateral arc is a better fit to the image and would be produced by the same singly oriented columns which produced the intense circumscribed halo of the display.

Photograph �Don Gent - reproduced with permission.