G2moderate
The geomagnetic storm of 24 – 25 April 1978
On 24 – 25 April 1978 the Kp index reached 6: a G2 (moderate) storm, with 18 hours at Kp 5 or more. At its peak the lights could be seen from 393,821 places in the atlas, down to about 49° magnetic latitude.
Kp 6Peak Kp · 24 April 1978 00:00 UT
18Hours at Kp 5 or more
80Largest ap
Solar cycle 21Year 3 of solar cycle 21
Kp every three hours
56789
23 Apr24 Apr25 Apr26 Apr
Where the lights could be seen
At Kp 6 the lights reach 393,821 places of the atlas on the horizon and 138,996 overhead, down to about 49° magnetic latitude.
The largest towns that could see them
MoscowRussia · 13.3MSaint PetersburgRussia · 5.65MTorontoCanada · 2.79MChicagoUnited States · 2.73MMinskBelarus · 2MMontrealCanada · 1.9MHamburgGermany · 1.87MNovosibirskRussia · 1.64MYekaterinburgRussia · 1.47MKazanRussia · 1.33MCalgaryCanada · 1.31MNizhny NovgorodRussia · 1.2MChelyabinskRussia · 1.18MSamaraRussia · 1.15MUfaRussia · 1.14MOmskRussia · 1.1MKrasnoyarskRussia · 1.09MPermRussia · 1.03MOttawaCanada · 1.02MEdmontonCanada · 1.01MStockholmSweden · 985kColumbusUnited States · 906kIndianapolisUnited States · 888kTyumenRussia · 872k