Visibility IV / V
Courtesy of bear cameras from the northern lights of the night between Thursday and Friday.
First video compilation from 22:20-23:30. In those few individual pictures, the area covered by red is quite clearly visible, especially around 22:55(?)
Especially in this second video summary (approx. 00:40-01:50) what caught my attention, or why I started to make observations about these in the first place, is the fact that the northern lights seem to be in a real "hurry" towards the east. According to earth.nullschool.net, the wind speed in the upper atmosphere (approx. 50 km altitude) seemed to be 50 km/h. Of course, the northern lights are still much higher than this, and that's why there are e.g. Studies like #BRORkiruna:n .
In short, you could say that there were quite a few aurora arcs...and they were great, even if the number (of pictures) doesn't always make up for the quality.
It is uncertain whether the whole sky is aurora borealis, or more than half of the sky is aurora borealis - I now put the whole sky as aurora borealis, because even in the far southern sky these visible aurora borealis covered the Pori area as well.