All-time record: Kp 9.0 — reached on 27 days, most recently 2024-05-11.
Ranked from the data: peak Kp, then intervals spent at 9.0. Nicknames and reach notes only where documented.
Two ways to hear about aurora — the whole planet, or your one spot. Free browser notifications, no email, unsubscribe in a tap.
One push whenever NOAA forecasts a G1+ geomagnetic storm within 48 hours — wherever you are. On a big night the aurora reaches far south of its usual latitudes.
Pick any of the 70 watch points — we’ll watch its own Kp threshold, the dark window and the cloud cover for you.