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On Thu, 13 Jan 2000, Veikko Makela wrote:
> In case of winter and diamond dust in the air may be so close enough
> the reflecting surface the reflected halo effect is possible. You
Interesting conversation! I saw once how sunlight reflected from ordinary
windows caused "sun pillars" in a weak diamond dust halo display. I don't
think such a sight is a very uncommon one.
Halos caused by other halos, i.e. secondary halos, i.e. multiple
scattering halos, are another, very interesting topic. I believe there is
no very good evidence of their existence.
Mika Sillanpää
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