Contains:  Solar system body or event
Extra bright upper sun pillar and tangent arc haloes observed at sunset under some harsh conditions (-38 deg. C and dropping), 



    
        

            Alexandr Zaytsev

Extra bright upper sun pillar and tangent arc haloes observed at sunset under some harsh conditions (-38 deg. C and dropping)

Extra bright upper sun pillar and tangent arc haloes observed at sunset under some harsh conditions (-38 deg. C and dropping), 



    
        

            Alexandr Zaytsev

Extra bright upper sun pillar and tangent arc haloes observed at sunset under some harsh conditions (-38 deg. C and dropping)

Equipment

Imaging Cameras
Nikon Coolpix 8800

Acquisition details

Resolution: 3162x2388

File size: 2.7 MB

Data source: Traveller

Description

Upper sun pillar and the tangent arc ("V-fork") halo observed before, during and after the sunset on Jan 27, 2006 in Novosibirsk, RU (+54.9 deg. latitude) under the harsh weather conditions of

- Ground temp.: -38 deg. C (and dropping)
- RH: 48%
- Wind speed/direction: 11 km/h (S)

The acquired image sequence is based on single frame 1/30-1/500s exposures with handheld camera, and the FOV on the widest angle image in the sequence (by the longs side) is about 54 deg, while the FOV on the narrowest - about 5.9 deg (also by the long side). The current frame is a single ISO50 f/4.3 1/125s exposure.

A good reference to formation and changes to the sun pillar haloes is give under [1] (the image is taken from there, (C) Les Cowley):

[1] https://atoptics.co.uk/halo/pillalt1.htm




The changes in shape of upper tangent arc, also observed here, as shown in the rev. E, at about 22-25 deg. above the sun even after it goes under the horizon down to -5 deg. are illustrated under [2] (the images below is taken from there, showing how the tangent arc turns from a shallow curve to the V shaped cusp as the sub goes down):

[2] https://atoptics.co.uk/halo/colsolat.htm





The screenshot attached whos the simulation for the halo arrangement that looks pretty close to what was observed on that day for the -3 deg. sun altitude (made with excellent HaloSim software [3]):



[3] https://atoptics.co.uk/halo/halfeat.htm

Comments

Revisions

  • Final
    Extra bright upper sun pillar and tangent arc haloes observed at sunset under some harsh conditions (-38 deg. C and dropping), 



    
        

            Alexandr Zaytsev
    Original
  • Extra bright upper sun pillar and tangent arc haloes observed at sunset under some harsh conditions (-38 deg. C and dropping), 



    
        

            Alexandr Zaytsev
    B
  • Extra bright upper sun pillar and tangent arc haloes observed at sunset under some harsh conditions (-38 deg. C and dropping), 



    
        

            Alexandr Zaytsev
    C
  • Extra bright upper sun pillar and tangent arc haloes observed at sunset under some harsh conditions (-38 deg. C and dropping), 



    
        

            Alexandr Zaytsev
    D
  • Extra bright upper sun pillar and tangent arc haloes observed at sunset under some harsh conditions (-38 deg. C and dropping), 



    
        

            Alexandr Zaytsev
    E
  • Extra bright upper sun pillar and tangent arc haloes observed at sunset under some harsh conditions (-38 deg. C and dropping), 



    
        

            Alexandr Zaytsev
    F
  • Extra bright upper sun pillar and tangent arc haloes observed at sunset under some harsh conditions (-38 deg. C and dropping), 



    
        

            Alexandr Zaytsev
    G
  • Extra bright upper sun pillar and tangent arc haloes observed at sunset under some harsh conditions (-38 deg. C and dropping), 



    
        

            Alexandr Zaytsev
    H

B

Title: Mid-zoom on the pillar while sunset is in progress

Description: A single ISO50 f/4.3 1/125s exposure.

Uploaded: ...

C

Title: High-zoom on the pillar while sunset is in progress

Description: A single ISO50 f/5.8 1/125s exposure.

Uploaded: ...

D

Title: High-zoom on the pillar at the end of sunset

Description: A single ISO50 f/5.8 1/30s exposure.

Uploaded: ...

E

Title: Post sunset halo arrangement with the sun pillar and tangent arc at the end of it

Description: A single ISO50 f/2.9 1/250s exposure.

Uploaded: ...

F

Title: Plane passing across the sun pillar post-sunset

Description: A single ISO50 f/3.4 1/125s exposure.

Uploaded: ...

G

Title: Wide angle view to the whole halo arrangement just before sunset - looking like a bolide going down to hit Earth=)

Description: A single ISO50 f/8 1/60s exposure.

Uploaded: ...

H

Title: Alternative processing of the mid-zoom on the sun pillar just before sunset - looking rather ominous

Description: A single ISO50 f/5.2 1/500s exposure.

Uploaded: ...

Histogram

Extra bright upper sun pillar and tangent arc haloes observed at sunset under some harsh conditions (-38 deg. C and dropping), 



    
        

            Alexandr Zaytsev