G3strong
The geomagnetic storm of 3 July 1939
On 3 July 1939 the Kp index reached 7−: a G3 (strong) storm, with 12 hours at Kp 5 or more. At its peak the lights could be seen from 474,355 places in the atlas, down to about 48° magnetic latitude.
Kp 7−Peak Kp · 3 July 1939 12:00 UT
12Hours at Kp 5 or more
111Largest ap
Solar cycle 17Year 6 of solar cycle 17
Kp every three hours
56789
2 Jul3 Jul4 Jul
Where the lights could be seen
At Kp 7− the lights reach 474,355 places of the atlas on the horizon and 193,483 overhead, down to about 48° magnetic latitude.
The largest towns that could see them
MoscowRussia · 13.3MNew York CityUnited States · 8.8MSaint PetersburgRussia · 5.65MMelbourneAustralia · 5.35MBerlinGermany · 3.7MTorontoCanada · 2.79MBrooklynUnited States · 2.74MChicagoUnited States · 2.73MQueensUnited States · 2.41MMinskBelarus · 2MMontrealCanada · 1.9MHamburgGermany · 1.87MWarsawPoland · 1.86MManhattanUnited States · 1.69MNovosibirskRussia · 1.64MPhiladelphiaUnited States · 1.6MThe BronxUnited States · 1.47MYekaterinburgRussia · 1.47MKazanRussia · 1.33MCalgaryCanada · 1.31MAstanaKazakhstan · 1.24MNizhny NovgorodRussia · 1.2MChelyabinskRussia · 1.18MHannoverGermany · 1.16M