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Dear Meteoptics Watchers,
May I make a plea for more images of "twinned" primary rainbows
and indeed any other anomalous bows. The twinned bows
appear to be a phenomena that has not been very widely observed
or reported.
If possible use two lens focal lengths (short and long) so that the
separation of the bows can be estimated from the bow curvature on
the shorter focus shots whilst the longer focus lens will hopefully show
the colour distribution nicely.
Mie and Airy scattering programs can nowadays easily simulate
primary bow and supernumerary colours well. It will be interesting
to match new "twinned" bow images against their predictions and
those of other models that employ mixtures of non spherical/spherical
raindrops or even storms with mixed drops of water and ice. The test
of all these hypotheses is more observations!
Les
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