Nice halo display in the sky on 4th of May 2015

Observed phenomena: Halo phenomena
Light source: Sun
Origin: High clouds (cirrostratus, cirrus)
Observed halo forms:

  • 22° halo
  • Parhelia
  • 22° tangent arcs
  • Parhelic circle
  • 120° parhelia
  • Wegener antisolar arc

Date: 04.05.2015
Time: 14:20-16:00
Observing place: Pori-Helsinki, Finland
Observing method: Photography
Technical information about photographing equipment: Camera: Olympus µ 1030 SW

On monday 4th of May 2015 I was travelling from Pori to Helsinki by bus. While sitting in the bus, I was able to observe a pretty nice halo display in the sky. During the journey, I spotted bright 22° tangent arcs with 22° halo and parhelia and bright segments of parhelic circle several times. With the parhelic circle, I also observed 120° parhelia and a segment of Wegener antisolar arc! This display was dominated by singly-oriented, well-developed columnal crystals. Besides this, there were also some plate crystals present in this display. It was certainly one of the best halo displays that I have observed so far during this spring!

Upper 22° tangent arc and 22° halo @ 11:25 UT.
Upper 22° tangent arc and 22° halo @ 11:25 UT.
Parhelic circle and Wegener antisolar arc @11:29 UT
Parhelic circle and Wegener antisolar arc @11:29 UT
Parhelic circle and 120° parhelion @ 12:07 UT
Parhelic circle and 120° parhelion @ 12:07 UT
22° halo, 22° tangent arcs, parhelion and parhelic circle @ 12:37 UT
22° halo, 22° tangent arcs, parhelion and parhelic circle @ 12:37 UT
Advertisements