Visibility IV / V
I also dug up old northern lights, and from this and the other two pictures I found a dune-like formation on the left side. The formation moved a few minutes further south, away from the field of view. It is no longer visible in the image taken at 21.33. I have processed the image quite heavily to make the dunes I assume more visible.
My diary includes e.g. an indication of the final stage of the northern lights, after the corona at about 11.30 pm: "Finally, fast streaks and spots flashed in the sky, which I could not picture, for the changes took place even in tenths of a second. I have not just seen such a thing."
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