G5extreme

The geomagnetic storm of 26 – 27 July 1946

On 26 – 27 July 1946 the Kp index reached 9: a G5 (extreme) storm, with 21 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 · 27 July 1946 06:00 UT

21Hours at Kp 5 or more

400Largest ap

Solar cycle 18Year 3 of solar cycle 18

Kp every three hours

56789

25 Jul26 Jul27 Jul28 Jul

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.

Countries

Russia177,227 placesUnited States120,114 placesGermany68,900 placesPoland45,062 placesUnited Kingdom33,742 placesUkraine29,227 placesSweden27,876 placesBelarus25,170 placesFrance25,028 placesFinland24,291 places

At the edge: just within reach

SydneyAustraliaPerthAustraliaViennaAustriaMunichGermanyRostov-on-DonRussiaAtlantaUnited StatesBratislavaSlovakiaAtyrauKazakhstan

The largest towns that could see them

Before and after

Previous storm25 July 1946 · Kp 5−

Next storm29 – 30 July 1946 · Kp 7

1946

Geomagnetic storms of 1946Every storm

Geomagnetic storms since 1932Geomagnetic storm archive

Strong storms at the same time of year

26 – 27 July 2004Kp 9− · 27 h

24 – 27 July 1981Kp 8+ · 45 h

26 – 27 July 1961Kp 8+ · 24 h

24 – 26 July 2004Kp 8 · 36 h

30 – 31 July 1999Kp 8− · 18 h

28 – 29 July 1990Kp 8− · 39 h