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G3Peak 20 September 2015 at 06:00 UTC

Northern Lights on 20 September 2015 (Kp 7): Where They Were Visible

Kp reached 7. At that level the edge of the auroral oval reaches about 52.5° magnetic latitude, so the aurora could be seen low on the horizon down to roughly 48.0°. Activity stayed at storm level (Kp 5 or more) for 12 hours.

03579 G1 G3 Sat 19 Sept 03:00 UTC · Kp 4.00 Sat 19 Sept 06:00 UTC · Kp 4.67 Sat 19 Sept 09:00 UTC · Kp 2.67 Sat 19 Sept 12:00 UTC · Kp 1.67 Sat 19 Sept 15:00 UTC · Kp 0.33 Sat 19 Sept 18:00 UTC · Kp 1.00 Sat 19 Sept 21:00 UTC · Kp 3.00 Sun 20 Sept 00:00 UTC · Kp 3.00 Sun 20 Sept 03:00 UTC · Kp 4.67 Sun 20 Sept 06:00 UTC · Kp 7.00 Sun 20 Sept 09:00 UTC · Kp 5.33 Sun 20 Sept 12:00 UTC · Kp 4.33 Sun 20 Sept 15:00 UTC · Kp 5.00 Sun 20 Sept 18:00 UTC · Kp 2.67 Sun 20 Sept 21:00 UTC · Kp 3.00 Mon 21 Sept 00:00 UTC · Kp 3.33 Mon 21 Sept 03:00 UTC · Kp 2.67 Mon 21 Sept 06:00 UTC · Kp 1.67 Mon 21 Sept 09:00 UTC · Kp 2.33 Mon 21 Sept 12:00 UTC · Kp 1.67 Mon 21 Sept 15:00 UTC · Kp 1.67 Sun 20 SeptMon 21 Sept
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

2,178 towns on our list had enough activity while it was dark there. Cloud cover is not included.

CountryPlacesExamplesFurthest from the pole
United States 1,535 New York City, Brooklyn, Chicago, Queens St. Louis
Canada 407 Toronto, Montreal, Calgary, Ottawa Eastern Passage
Finland 102 Tampere urban area, Oulu central locality, Turku, Jyväskylä Turku
Norway 34 Trondheim, Ålesund, Tromsø, Åsane Nesttun
United Kingdom 24 Aberdeen, Dundee, Inverness, Perth St Andrews
Sweden 23 Umeå, Luleå, Gävle, Sundsvall Borlänge
Iceland 18 Reykjavík, Kópavogur, Hafnarfjörður, Reykjanesbær Vík í Mýrdal
New Zealand 18 Christchurch, Dunedin, Invercargill, Rolleston Greymouth
Australia 7 Hobart, Launceston, Devonport, Burnie Burnie
Greenland 6 Nuuk, Sisimiut, Ilulissat, Qaqortoq Qaqortoq
Faroe Islands 4 Tórshavn, Klaksvík, Fuglafjørður, Miðvágur Tórshavn
Based on each place's Kp threshold (terrain included) and the Sun's position during each 3-hour Kp block.

Only in photos

1,585 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.

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