Ice Crystal Halos

Another phase of the Lascar display. Three photos are stacked from sun elevation range of about 32° to 30°. Familiar halos are 23° and 20° plate arcs. Other halos are not so familiar.

This was seen on 27 November 1997 in Chile, on the foot of Lascar volcano, where Leena Virta and I photographed it. The image – that is stacked from nine slides – presents only one stage of the display. The…

The diamond dust that developed on the night of 5/6 November stayed until next midday. Here are two photos of what was seen in the daytime. The diffuse arcs were at times quite strong, showing up against buildings some 100…

This view shows several “rare white arcs”. On the right the long spectral arc is 46 supra/infralateral arc. Towards the middle of the image from top to bottom are helic, subhelic and Wegener arcs. Diffuse and Tricker anthelic arcs are…

On a couple of days there have been ground halos in Juva. It was best seen on a sportsfield running track. I stacked 45 images in Photoshop. Photographed with 10-mm and cropsensor. Text: Jari Piikki