G4Peak 20 August 1991 at 12:00 UTC
Northern Lights on 20 August 1991 (Kp 7.7): Where They Were Visible
Kp reached 7.7. At that level the edge of the auroral oval reaches about 51.2° magnetic latitude, so the aurora could be seen low on the horizon down to roughly 46.7°. Activity stayed at storm level (Kp 5 or more) for 30 hours.
Kp 0–3 Kp 4 Kp 5–6 (G1–G2) Kp 7+ (G3+) Times in UTC; faded bars are forecasts.
Three-hourly Kp from GFZ, one day either side of the storm.
Where the aurora could be seen
6,731 towns on our list had enough activity while it was dark there. Cloud cover is not included.
Only in photos
3,961 more towns could have caught a faint red or green glow low on the horizon with a phone or camera.
- HungaryBudapest, Debrecen, Szeged
- NetherlandsRotterdam, Amsterdam, The Hague
- CroatiaZagreb, Rijeka, Osijek
- SwitzerlandZürich, Geneva, Basel
- SloveniaLjubljana, Maribor, Celje
- FranceLyon, Nantes, Rennes
- ItalyMilan, Torino, Verona
- BelgiumBrussels, Antwerp, Ghent
- AustriaVienna, Graz, Linz
- SlovakiaBratislava, Petržalka, Nitra
- LiechtensteinSchaan, Triesen, Balzers
- ArgentinaRío Gallegos, Ushuaia, Río Grande
- ChilePunta Arenas, Porvenir, Puerto Williams
- JapanAsahikawa, Kitami
- UkraineKyiv, Odesa
- South AfricaCape Town, Gqeberha
- CzechiaDěčín
- SerbiaBelgrade
- Falkland IslandsStanley
Whether the aurora was actually seen also depended on the weather. Use this as a guide to where it was possible.