The aurora is a sky hobby with a transportation problem.
Fly earlier than your ego wants
Arrive with a night to spare before your big chase evenings. Leave with a night to spare after. Weather delays are common; heartbreak connections are optional.
Watch TOS and your gateway
If you transit OSL, monitor both airports on the board. A clean aurora forecast means nothing if you are stuck on a jetway.
Ground truth
Clouds block lights. So do exhausted travellers who scheduled four tours and zero sleep.
More: Tromsø flights in winter.