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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 34 — Dec. 1, 2008
  • pp: H199–H202

Rare display of eight concentric halos in Tampere, Finland, on 5 June 2008

Jari Luomanen  »View Author Affiliations

Applied Optics, Vol. 47, Issue 34, pp. H199-H202 (2008)

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On 5 June 2008 there was a rare display of eight concentric halos in Tampere, Finland. I present a preliminary analysis of this display. A brief comparison with earlier major odd-radius displays is made. Short faint arcs intersecting the Sun and their resemblance to the theoretical odd-radius helic arcs are discussed. A stacked image consisting of 72 individual frames of the display is presented. A single frame is provided for comparison, and the visual observation is described in some detail. Postprocessing techniques for halo photographs are discussed. A stacked simulation and the relevant crystal populations are presented.

© 2008 Optical Society of America

OCIS Codes
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(010.2940) Atmospheric and oceanic optics : Ice crystal phenomena

Original Manuscript: July 10, 2008
Revised Manuscript: October 25, 2008
Manuscript Accepted: November 5, 2008
Published: November 21, 2008

Jari Luomanen, "Rare display of eight concentric halos in Tampere, Finland, on 5 June 2008," Appl. Opt. 47, H199-H202 (2008)

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  1. Ursa Astronomical Association's halo mailing list archive 2008; from 5 June 2008 onward, http://www.ursa.fi/ursa/viestinta/listat/ilmakeha2-l/summary.html.
  2. W. Tape and J. Moilanen, Atmospheric Halos and the Search for Angle x (American Geophysical Union, 2006). [CrossRef]
  3. M. Riikonen, “Distinction of 22, 23, and 24° halos from snow surface,” http://www.ursa.fi/blogit/ice_crystal_halos/index.php?title=distinction_of_22_23_and_24d_halos_from_&more=1&c=1&tb=1&pb=1 (2008).
  4. M. Pekkola, M. Sillanpää, and J. Ruoskanen, “Valkean taivaan vieraat. Tähtitieteellinen yhdistys URSA, Helsinki” (1998).
  5. J. Ruoskanen, “Riihimäki 5.6.2008,” http://www.kolumbus.fi/jukka.ruoskanen/Halot/050608/index.html (2008).
  6. J. Luomanen, “Pyramidal halo display 05 June 2008, Tampere,” http://www.kolumbus.fi/jari.luomanen/x-ilmakeha/atmosphere1497-1537.html (2008).
  7. M. Riikonen and J. Ruoskanen, “Stacking technique in halo photography,” presented at the Ninth International Meeting on Light and Color in Nature, Bozeman, Montana, USA, 25-29 June, 2007.
  8. J. Luomanen, “Pixel workout - exposure, histogram, and bit depth in halo photography,” presented at the International Halo Meeting, Artjarvi, Finland, 14-16 July, 2006.

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