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G1Peak 17 September 2021 at 21:00 UTC

Northern Lights on 17 September 2021 (Kp 5.3): Where They Were Visible

Kp reached 5.3. At that level the edge of the auroral oval reaches about 55.8° magnetic latitude, so the aurora could be seen low on the horizon down to roughly 51.3°. Activity stayed at storm level (Kp 5 or more) for 6 hours.

03579 G1 G3 Thu 16 Sept 18:00 UTC · Kp 0.67 Thu 16 Sept 21:00 UTC · Kp 1.00 Fri 17 Sept 00:00 UTC · Kp 2.00 Fri 17 Sept 03:00 UTC · Kp 3.00 Fri 17 Sept 06:00 UTC · Kp 0.67 Fri 17 Sept 09:00 UTC · Kp 3.33 Fri 17 Sept 12:00 UTC · Kp 3.00 Fri 17 Sept 15:00 UTC · Kp 3.67 Fri 17 Sept 18:00 UTC · Kp 5.00 Fri 17 Sept 21:00 UTC · Kp 5.33 Sat 18 Sept 00:00 UTC · Kp 2.67 Sat 18 Sept 03:00 UTC · Kp 3.33 Sat 18 Sept 06:00 UTC · Kp 3.00 Sat 18 Sept 09:00 UTC · Kp 2.33 Sat 18 Sept 12:00 UTC · Kp 1.67 Sat 18 Sept 15:00 UTC · Kp 0.33 Sat 18 Sept 18:00 UTC · Kp 0.33 Sat 18 Sept 21:00 UTC · Kp 0.67 Fri 17 SeptSat 18 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

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

CountryPlacesExamplesFurthest from the pole
United Kingdom 169 Glasgow, Edinburgh, Belfast, Newcastle upon Tyne Middlesbrough
Sweden 148 Stockholm, Gothenburg, Malmö, Uppsala Trelleborg
Finland 123 Helsinki, Espoon keskus, Tampere urban area, Vantaa Raseborg
Denmark 93 Copenhagen, Aarhus, Odense, Aalborg Nakskov
Norway 77 Oslo, Bergen, Trondheim, Stavanger Mandal
Latvia 39 Riga, Daugavpils, Liepāja, Jelgava Daugavpils
Lithuania 25 Kaunas, Klaipeda City Municipality, Šiauliai, Panevėžys Kaunas
Estonia 21 Tallinn, Tartu, Narva, Pärnu Võru
Iceland 18 Reykjavík, Kópavogur, Hafnarfjörður, Reykjanesbær Vík í Mýrdal
Canada 7 Winnipeg, Thunder Bay, Steinbach, Kenora Thunder Bay
Greenland 6 Nuuk, Sisimiut, Ilulissat, Qaqortoq Qaqortoq
Faroe Islands 4 Tórshavn, Klaksvík, Fuglafjørður, Miðvágur Tórshavn
Ireland 2 Letterkenny, Sligo Sligo
Australia 1 Cradle Mountain Cradle Mountain
Germany 1 Westerland Westerland
Kazakhstan 1 Petropavl Petropavl
Svalbard & Jan Mayen 1 Longyearbyen Longyearbyen
Based on each place's Kp threshold (terrain included) and the Sun's position during each 3-hour Kp block.

Only in photos

1,395 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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