Home › Geomagnetic history › 1940

Geomagnetic storm on 3 Jan 1940 (G4)

Max Kp8-G4

Ap47No. 17 in 1940

Consecutive G1+ days3

Ap rank1,056since 1932

Kp by 3-hour slot (UTC)

00–032o

03–064-

06–094-

09–123+

12–155+

15–188-

18–215o

21–244o

The days around it

Date	Max Kp	Ap	Level
31 Dec 1939	2o	3	–
1 Jan 1940	3+	10	–
2 Jan 1940	4o	14	–
3 Jan 1940	8-	47	G4
4 Jan 1940	5o	24	G1
5 Jan 1940	5o	12	G1
6 Jan 1940	4+	20	–

Highest-Ap days of 1940

30 Mar 1940189

24 Mar 1940187

25 Mar 1940184

31 Mar 1940128

25 Jun 1940126

29 Mar 1940100

3 Apr 194098

24 May 194078

25 Apr 194070

1 Apr 194066

Dates and time slots are UTC. Kp is the 3-hourly planetary geomagnetic index (0–9); Ap is the daily average disturbance. G1–G5 follow the NOAA storm scale (Kp 5- and above counted as G1). Aurora visibility also depends on weather and location. The latest values are preliminary.

← 15 Oct 1939 18 Jan 1940 →

About this page

Max Kp 8-, Ap 47: No. 1,056 of 34,615 days since 1932 by Ap.