What's New 
  Rays & Shadows
  Water Droplets
  Ice Halos
    Frequent Halos
    Infrequent Halos
      Why infrequent?
      46° Halo 
        or supralateral?
      Parry Arcs
      Lowitz Arcs
      Moilanen Arc
      Kern Arc

      120° Parhelia
      44° Parhelia
      Subhorizon Arcs
    Multiple Displays
    Other Worlds
    Observing Halos
  High Atmosphere
  Links & Resources
  Search - Index


   46� Radius Halo 

Ray trace simulation by HaloSim.  Halos are: (a) 46°, (b) faint supralateral arc, (c) faint infralateral arc, (d) parhelic circle (e) 22°, (f) parhelia, (g) tangent arc (h) Suncave Parry and (j) circumzenithal arc. Crystals were: random 54%, columns 20%, Parry 4% and plates 22%. Oriented crystals were given fairly large wobbles.


Antarctic halo display at Halley 5, Brunt Ice Shelf, Coats Land captured with a fisheye lens by Jon Oldroyd (site). The large outer circular halo is (partly) the rare 46° halo. Several other halos are present - see the simulation. Image ©Jon Oldroyd.

The 46° halo is rare and huge. Two outspread hands from the sun, it spreads across the sky.

Its colours are also well spread. They are pastel with red on the inside and no real greens or blues.

But - If you see a fragment of a very large coloured halo twice as far from the sun as the everyday 22°, it may not be a 46° halo!

Supralateral and infralateral arcs lie in a similar position and are often mistaken for the rarer 46°.

See how to distinguish between the two halos.