Auroral Sub-arcs Triggers And Expansion
Taken by Alexandre LHOEST on February 12, 2018 @ Skibotn, Norway
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Here, some videos of auroras made in Norway.
All captures were made with a fisheye.

1° The first aurora is powerful enough to be filmed.
It is quite slow and the video here is accelerated 25x to cover 22 minutes.

2° Then, successive triggering of auroral sub-arcs takes over.
The expansion phase follows.
The whole process took about 6 minutes.

3° The triggering phase itself is very short. Everything happens in about 60 seconds, before the expansion takes over.
The following video is presented in real time. The exposure time is 1/4 seconds, hence the jerky appearance.

The link to the 3 viedos:

Norway, 69°N
Sony A7s
Samyang 12mm Fisheye.
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