The elliptical halo display observed yesterday by Marko Riikonen and Jari Luomanen was formed - as usual - in Ac virga. Marko had been paying much attention to Ac virgas for some time, and could therefore observe the whole display from beginning to end. From his perspective the display lasted six minutes between 10:18 - 10:24 and was uniformly good during the whole period. From Jari's place of observation, the best phase lasted a couple of seconds only.
More photos of the observation can be seen in their galleries ( 1 - 2 ).