Possible Pollen Corona at Sunset

There was no sign of moisture in the air on this dry evening so I think this weak corona above the setting sun might be due to pollen.

There are extensive fields in this direction and the oilseed was in flower so that was a potential source.

The corona was still visible even after the first ring dropped below the horizon.

A few nights later in almost the same area and there is no sign of anything unusual.

Canon EOS 20D   23rd May 2010
Wiltshire, England

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