It looks like a liquid fueled rocket launch, nearing or during second stage cut off. If this was observed from directly behind the rocket, there would appear to be a black hole in the center when the motor cuts off. In the edge of space, there is no atmospheric pressure to contain the exhaust from the rocket engine, so the plume spreads out and looks that way.
Here is a time exposure of the launch of the Kepler Space Telescope. From left to right, you can see the plume suddenly end and see either the next stage engine firing up, or the still glowing hot engine that just cut off.
As far north as they were, the ionized exhaust gases may be reacting with the solar wind, sort of like a mini aura borealis, giving it that blue green color. They used to launch rockets with a small explosive warhead loaded with bromine compounds into the ionosphere during the 1960's to observe how it would distribute the chemical in the upper atmosphere. The events were fascinating to watch.
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