I have recently taken a picture while on a walk, which is showing a phenomenon I cannot really find an explanation of.
A contrail was visible in the air, backed with a dark line that went all the way to the ground. The dark line was visible only for 1 minute, the sun was directly in line with the contrail. Though my first idea was to say it is a shadow, it doesn’t really make sense to me, because I would not expect the shadow to be loosely projected into the atmosphere. Also, a contrail does not seem to be dense enough for a dense shadow like this one.
The plane flying was a Boeing KC-135R Stratotanker, which can produce a large contrail with its four engines, which nevertheless could point to a shadow or weird refraction. Please help, I would like to know how this happened!
Time: August 3rd, 2:40 pm
Location: (53.118526, 9.198616)