The photograph lied, and you already knew it
The aurora borealis, in real life, does not look like the aurora borealis in photographs. The greens are muted. The curtains move slowly, sometimes almost imperceptibly, like smoke that has forgotten it is supposed to rise. A camera set to a 15-second exposure gathers light the human eye cannot, which is why every image you have seen, on Instagram, in travel magazines, on the homepage of every Scandinavian tourism board, is technically accurate and experientially false. What you see with your own eyes is closer to a pale smear across the northern sky, greenish-grey rather than electric green, occasionally brightening into something that makes you grab the arm of whoever is standing next to you.