2006. április 21., péntek

Tranquility of a high-sun halo display

This fairly decent high-sun display was captured while I was on lunch break. Although there were no rare halos but there was 22d halo, circumscribed halo, smooth complete parhelic circle, and faint circumhorizon arc. The best part in my opinion was the parhelic circle. I have applied unsharp mask to bring the halos out better. Photos were taken on the 11th.

2 megjegyzés:

  1. Frank Nieuwenhuys2006. április 22. 0:28

    Looks jolly relaxed indeed!
    Michael, where did you make the pictures? If it's somewhere on the northern hemisphere, the location has to be South of 40 deg. North, on April 11th, because the circumhorizon arc requires at least 59 deg. solar elevation.

    VálaszTörlés
  2. Frank Nieuwenhuys2006. április 23. 0:39

    You are well-informed. It seems, I was the first one who captured the odd-radius column arcs photograpically, on June 15th '73. Of course, at that moment, I didn't know precisely what I observed and photographed, but I can remember I was excited, because I saw and felt, the display was quite unusual and "exotic"; it looked very odd. I described the 9 deg. column arc as an "elliptical halo". Unfortunately, I had only a 55 mm standard lens on my camera, so the pictures show only parts of the display. The original slides are well-kept here in The Hague (Netherlands); duplicates are in Finland, and one of the enhanced pictures is published in the September 2003 issue of "Weather" (as part of the "Rare odd-radius column arcs" paper). You can view both the original and enhanced picture (figure 3), together with the pictures of the September 17th 2001 Oulu (Finland) display on the following site:
    http://users.tkk.fi/~masillan/oddradii/

    VálaszTörlés