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If the first-order interference bow is so much separated from the primary,
and so intense, that would mean very small droplet sizes, and the bow
would
be more white I think. If I remember well, Les Cowley did some
simulations
of such a rainbow, with oblate droplets and also frozen raindrops.
At the back of thunderstorms there can be drizzle (more round droplets due
to surface tension) mixed with big droplets from molten hail/graupel
(oblate due to air resistance). Thus there might be two distinct drop
shapes in the downdraft and thus a separation of two rainbows (one round,
one oval). That would indeed be at the top part of the rainbow, which is
most prone to deformation due to non-round droplets. (The horizontal
cross-section of oblate droplets is still circular, but the vertical
cross-section is oval).
Harald
>I think there is main primary rainbow with extraordinary
>strong first interference bow. I some cases, when the
>drop size suitable, the second intensity mximum could
>be rather strong nad the colors are very well separated.
>
>It there anybody who can calculated what is the needed
>droplet size for this condition.
>
>-VeikkoM-
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