G4Peak 19 August 1991 at 06:00 UTC
Northern Lights on 19 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 21 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
2,661 towns on our list had enough activity while it was dark there. Cloud cover is not included.
Only in photos
1,667 more towns could have caught a faint red or green glow low on the horizon with a phone or camera.
Whether the aurora was actually seen also depended on the weather. Use this as a guide to where it was possible.