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Hi. I was wondering if anyone has an explanation for this observation
which appeared in the science forum I frequent. I am unable to explain it
despite racking my brains. Thanks.
Greg L.
>Recently, on one of those superb warm, still, clear days that Victoria
>(and SA) throw into autumn, local farmers were busy producing greenhouse
>gasses by burning off the dry gry grass in their paddocks. At one stage
a
>tall column of smoke greatly dimmed the setting sun. Looking back I saw
>the most intense rainbow that I have ever seen. At first I thought it
had been
>caused by nucleation of moisture from the burning grass around dust
>particles. I then noticed that the spectrum was backwards compared with
>a normal rainbow (ie the violet was on the outer limb of the arc, not
the
>inner). You find this effect in the outer bow of a double rainbow, but
it is
>usually rather faint. This spectrum was intense and there was no sign of
an
>inner bow. Any explanations?
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