Displays

Helic arc is no news in snow gun generated diamond dust displays, but in high clouds the halo is extremely rare. Of the latter type, shown here is the latest case. The display was seen in Alpharetta, Georgia, U.S.A, in…

Winter’s first display in a spotlight beam was captured in the weekend by Jukka Ruoskanen. Click on the image to see the rest of his photos.

Here is an example of Moilanen arc with not even a hint of Parry or tangent arc. However, unlike in the previous post photo, there might be a suggestion of parhelia here. If there occurs a display where Moilanen arc…

This recently seen display, although not a bright one, highlights an important issue. There is the Moilanen arc but no plate arcs. “Not the slightest hint for circumzenith arc or sundogs. Absolutely nothing”, writes Bertram Radelow, who photographed the display…

Glenn Wolford photographed this display on November 9 in Syracuse, N.Y., U.S.A. The noteworthy feature is the upper Lowitz arc from Parry-Lowitz orientation. Click on the photo for simulation. Lowitz crystal tilts in the simulation are 13 degrees and sun…

While staying with relatives down in Bedford Indiana, one morning before we left to French Lick Casino I saw a large field of AC clouds slowly moving out of the area and I know AC clouds means elliptical halos. I…

Starting from the 1970’s we have seen numerous photos of subparhelic circle opposite to the sun and it is a little wonder that sub-120° parhelion has never been observed from an airplane. Even the sub-Liljequist parhelion, of which formation is…

It’s been before our noses for a year already ( 1 ): the weak colored arc reaching far outside the 46° halo in the display observed on the night of 5/6 November 2008 in Rovaniemi. I have thought of it…

These simulations show the relation of blue circle (from random crystals) and blue spot (from oriented crystals). Blue spot on parhelic circle occurs where blue circle crosses it. The blue circle itself has a radius of 64°, as Ágnes Kiricsi…

This 22° halo on ice surface was seen on 17 January in Tampere. It was more pronounced on the right side. Intensity asymmetry was not caused by local changes in crystal densities because it was seen wherever I walked on…