G5extreme
The geomagnetic storm of 7 – 9 February 1986
On 7 – 9 February 1986 the Kp index reached 9: a G5 (extreme) storm, with 60 hours at Kp 5 or more. At its peak the lights could be seen from 743,498 places in the atlas, down to about 43° magnetic latitude.
Kp 9Peak Kp · 8 February 1986 18:00 UT
60Hours at Kp 5 or more
400Largest ap
Solar cycle 21Year 10 of solar cycle 21
Kp every three hours
56789
6 Feb7 Feb8 Feb9 Feb10 Feb
Where the lights could be seen
At Kp 9 the lights reach 743,498 places of the atlas on the horizon and 454,586 overhead, down to about 43° magnetic latitude.
The largest towns that could see them
MoscowRussia · 13.3MNew York CityUnited States · 8.8MLondonUnited Kingdom · 8.8MSaint PetersburgRussia · 5.65MSydneyAustralia · 5.45MMelbourneAustralia · 5.35MBerlinGermany · 3.7MKyivUkraine · 2.95MTorontoCanada · 2.79MBrooklynUnited States · 2.74MChicagoUnited States · 2.73MQueensUnited States · 2.41MParisFrance · 2.1MPerthAustralia · 2.04MViennaAustria · 2.03MMinskBelarus · 2MMontrealCanada · 1.9MHamburgGermany · 1.87MWarsawPoland · 1.86MManhattanUnited States · 1.69MNovosibirskRussia · 1.64MPhiladelphiaUnited States · 1.6MUlaanbaatarMongolia · 1.52MMunichGermany · 1.51M