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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…

Last friday I was on a first aid course in Köngäs and noticed on the snow surface a suspicious looking 22° degree halo. The lack of sharp inner edge reminded me of last winters snow surface odd radius displays. So…

Last night at the Ylläs ski resort a diamond dust developed. Here is one photo showing the display at about 14 degrees of negative lamp elevation. There seem to be no halos from column crystals. The sparse crystals on the…

Yet another photo of the 5/6 November night in Rovaniemi shows blue spot on the right. The diamond dust was often quite thick with no stars visible above, and in the lamp light it felt like being inside a crystal…

One of the advantages of bright spotlight is that you need not to go through the trouble of getting in Ilyushin IL-76 to have a good view of halos below horizon. In diamond dust, just place the light below the…

Here is one stage of a display on the night of 5/6 November in Rovaniemi. The sharp intensity gradient at the zenith marks the outer edge of sun pillar, that has been formed from triangular columns – if parallel light…

Here is another display from the first diamond dust night Rovaniemi. The crystals were rather small as I was close to the snow guns. There was also Moilanen arc, but in the photo it is overexposed.