G2Peak 15 September 1999 at 09:00 UTC
Northern Lights on 15 September 1999 (Kp 5.7): Where They Were Visible
Kp reached 5.7. At that level the edge of the auroral oval reaches about 55.2° magnetic latitude, so the aurora could be seen low on the horizon down to roughly 50.7°. Activity stayed at storm level (Kp 5 or more) for 6 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
873 towns on our list had enough activity while it was dark there. Cloud cover is not included.
| Country | Places | Examples | Furthest from the pole |
|---|---|---|---|
| United States | 496 | Seattle, Milwaukee, Minneapolis, Saint Paul | Cedar Rapids |
| Canada | 360 | Toronto, Montreal, Calgary, Ottawa | Hamilton |
| New Zealand | 9 | Dunedin, Invercargill, Mosgiel, Wānaka | Wānaka |
| Australia | 7 | Hobart, Launceston, Devonport, Burnie | Burnie |
| Greenland | 1 | Nuuk | Nuuk |
Whether the aurora was actually seen also depended on the weather. Use this as a guide to where it was possible.