Light Halos on the ground?
I have often wondered what the explanation is of this strange effect. I fly single engine Cessnas and have often noticed below about 2500'AGL the shadow of the aircraft on the ground is surrounded by a halo of light. It actually appears from the cockpit that the ground surrounding the shadow of the aircraft is actually illuminated to a brighter level than the ambient light, if that makes any sense. Flying over dense bush or forest the shadow is invisible but there is still a bright ring of light visible. Why does it appear as if the ground is being illuminated by the aircraft?