Home   OPOD   What's New    Rays & Shadows   Water Droplets   Rainbows   Ice Halos     Contents     Crystals     Frequent Halos     Infrequent Halos       Why infrequent?       46° Halo        Supra/infralateral         Images         1  2  3        Parry Arcs       Lowitz Arcs       Moilanen Arc       Kern Arc       120° Parhelia       44° Parhelia       Subhorizon Arcs       Pyramidal     Multiple Displays     Other Worlds     Observing Halos     HaloSim   High Atmosphere   Links & Resources   Search - Index   123456789012345678		Supralateral arc II
		The England 9th February '01 display from the University of Birmingham. The display had faded somewhat when Ant Veal et.al. captured this all-sky view at 12.35 UTC. The supralateral arc stretches from near to the zenith right down to the campus clock tower at left. Simulations of the supralateral arc and a 46� halo overlie the image below. They show how difficult it can be to distinguish between them. Image �Ant Veal et. al., reproduced with permission.         Superimposed simulation Red spots trace supralateral and upper tangent arcs from horizontal column crystals. Blue spots trace 46� and 22� circular halos formed by poorly oriented crystals. Green spots mark the parhelic circle - plate crystals. Grey dashes are the simulation horizon (the camera was tilted slightly from the zenith). �

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