Corona - Ontario, Canada.
Wittnessed by Ray Jones of Belgrade, Montana while on a fishing vacation
in June '07. Why a pollen corona? It is (a) likely non circular,
(b) comparison with Mie scattering calculations predicts 20-30
micron sized scattering particles - the right size range for many
pollens, (c) there are multiple rings characteristic of monosized
tree pollen and (d) it was the boreal forest pollen season and
yellow powder filmed the lake surface. Image ©Ray Jones, shown