G3strong
The geomagnetic storm of 4 – 5 July 1957
On 4 – 5 July 1957 the Kp index reached 7+: a G3 (strong) storm, with 18 hours at Kp 5 or more. At its peak the lights could be seen from 557,072 places in the atlas, down to about 46° magnetic latitude.
Kp 7+Peak Kp · 5 July 1957 03:00 UT
18Hours at Kp 5 or more
154Largest ap
Solar cycle 19Year 4 of solar cycle 19
Kp every three hours
56789
3 Jul4 Jul5 Jul6 Jul
Where the lights could be seen
At Kp 7+ the lights reach 557,072 places of the atlas on the horizon and 263,224 overhead, down to about 46° magnetic latitude.
Countries
Russia170,303 placesUnited States85,607 placesPoland37,034 placesGermany36,724 placesUnited Kingdom31,755 placesSweden27,876 placesBelarus25,170 placesFinland24,291 placesLithuania20,495 placesCanada19,497 placesAt the edge: just within reach
KyivUkraineCologneGermanyWrocławPolandDüsseldorfGermanyLeipzigGermanyAktobeKazakhstanDresdenGermanyGentBelgiumThe largest towns that could see them
MoscowRussia · 13.3MNew York CityUnited States · 8.8MLondonUnited Kingdom · 8.8MSaint PetersburgRussia · 5.65MMelbourneAustralia · 5.35MBerlinGermany · 3.7MKyivUkraine · 2.95MTorontoCanada · 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 · 1.2M