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If it were Poisson's spot, it would have to be a scattered
reflection of the spot. The spot is much dimmer than the
light which surrounds the object that created it. Likewise,
reflections from the ground would scatter it again. I'm
having difficulty imagining that being visible amidst the
daylight all around the plane.
I think it's a glory. It might come from haze near the
ground. Or it could be a retrodirective reflection from the soil.
On Jan 14, 2013, at 6:06 PM, Aburr@aol.com wrote:
But could it possibly be a Poisson bright spot?
Alex. F. Burr
Forum for Physics Educators