Friday, 28 March 2008
Two hour long elliptical halo display on 23 March
After about 10 minutes the halo was gone but I kept a vigil on the sky. Patience was eventually paid off as more dissipating Ac cloud moved in and the display came back.
I later positioned a large wood stick with lens case to block the sun and laid on my back and watched the show. The magic really began when a large Ac fragment passed in front of the sun and turned into ice crystals. It showed three elliptical halos at once, sharp and bright and they were colored like the classical halos ( 1 - 2 - 3 ).
The display lasted for two hours. One thing I noticed while laying on my back and taking photos was that the ellipse would start out large and then gradually shrink.