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meteoptic-l [ät] ursa.fi
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...there's also backscattering preferentially in exactly the
direction
of the incident light, plus a probably small additional brightening due
to this backscatter being coherent.
The phenomenon is usually referred to as "heiligenschein". If there
are water droplets invovled (from bedewed ground or fog) you can also
see colored rings from diffraction, and this is called a "glory" or the
"spectre of Brocken".
\Brian
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