
At this Kp the oval extends past this location, so aurora can appear anywhere in the sky rather than only near the northern horizon. Kp says how far the oval reaches, not where the arc sits at a given minute — it can be a single band or fade out between substorms — so with clear, dark skies, watch the whole sky, not just north.
Nuuk sits at 64.2° geographic, but the oval is centred on the magnetic pole.
This far poleward you sit inside the oval even on quiet nights. Kp says how far the oval reaches, not where the arc is at a given moment.
Average across tonight's dark hours. Solid cloud cover. Even a strong display will be invisible from here. Right now it's 98%.
Dark until 05:15. Aurora is usually best around midnight.
The auroral oval is a ring centred on Earth's magnetic pole, not the geographic one. That is why Nuuk — at 64.2° geographic latitude — behaves like a 72.6° location as far as aurora is concerned. A higher Kp pushes that ring further from the pole, which is why your geomagnetic latitude — not your spot on a map — decides the number you need.
From here you sit inside the auroral oval at any Kp — what you need is a dark, clear sky rather than a storm. Kp says how far the oval reaches, not exactly where the arc sits at a given moment, so on a quiet night it may be a single band anywhere from the horizon to straight up. Find a spot with an unobstructed view north and away from street lighting. Give your eyes twenty minutes to adjust, and remember that a camera picks up colour long before the naked eye does.
One caveat worth knowing: these thresholds are averages, not promises. Kp is a planetary index covering three hours, so it cannot tell you where the aurora is at this minute — for that, NOAA's OVATION model maps the oval half an hour ahead. The real auroral oval moves around with the solar wind and reaches furthest from the pole near midnight, so any given night can run better or worse than the number suggests. Treat it as a good guide to whether tonight is worth your time, not a guarantee.
We'll email you when the Kp index is forecast to climb — the nights when displays over Nuuk, Greenland get bright and active. Nothing else.
Kp index and forecast from NOAA SWPC. Cloud cover and sun times from Open-Meteo. Geomagnetic latitude uses the IGRF-14 dipole for epoch 2025.