[Graewoulf]

The active link "other streams" in the above official explanation discusses anti-auroras.

In your humble, but always correct opinion, are the dark "pickets" between the "green pickets" anti-auroras?

If so, then the "picket fence" appearance is more likely due to the effect of the Earth's Magnetic field upon the incoming solar wind, rather than discrete pulses from the Sun.

[RightWhale]

dark "pickets" between the "green pickets" anti-auroras?

The spaces between the bright features are just more aurora. The aurora moves, the brighter the faster. There is another aurora at the opposite pole of earth that is very similar at the same time to Aurora Borealis and can be seen from NZ and Australia.