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Hi Greg,
Can you be more specific with respect to relative orientations and
positions? Maybe
a diagram would help. This sound really interesting.
Jim Crawford
Gregory Lynn wrote:
> 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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