Pulsating fragmented arc
This aurora was far stronger than anything you would have expected given the relatively weak solar wind, and there were no significant deviations on the magnetometers either. I've seen something similar after very large displays, with pulsating fragmented arcs, but usually the next day and much lower down. Can only think this was caused by residual effects following Thursday night's aurora.
Pulsating fragmented arc
This aurora was far stronger than anything you would have expected given the relatively weak solar wind, and there were no significant deviations on the magnetometers either. I've seen something similar after very large displays, with pulsating fragmented arcs, but usually the next day and much lower down. Can only think this was caused by residual effects following Thursday night's aurora.