Home    OPOD   What's New   Rays & Shadows   Water Droplets     Clouds & Fog     Droplets & Light     Corona     Iridescent Clouds     Fogbow        Visibility        Formation        To a rainbow        Car fogbows           Simulation           Another bow        Fogbows at sea        Arctic fogbow        Lunar fogbows        More images     The Glory     Heiligenschein     IRIS software   Rainbows   Ice Halos   High Atmosphere   Links & Resources   Search - Index                             123456789012345678		Car headlamp fogbows - Simulation
		Fogbow supernumeraries and glory rings are rich material for comparisons with simulations although the divergence of the headlamp beam introduces some uncertainty in the derived droplet sizes.   The lower section is an IRIS calculation for droplets of mean diameter 9.6 micron and a narrow size distribution (6% std.dev).   Droplets of greater size variation give supernumerary rings which are too diffuse.    Marko Riikonen says, "Fog with uniformly sized droplets is always fresh, just formed. On that night we found a place where fog formed and disappeared continuosly. So it was very interesting...     ...usually fog stays where it's formed and you do not then get a full set of arcs all the way from glory to fogbow because the droplet distribution is uneven. On the other hand, I think the places where fog comes and goes are not that rare. " Car fogbow from "older" fog.