1940Year 7 of solar cycle 17

Geomagnetic storms of 1940

1940 had 66 geomagnetic storms reaching Kp 5 or more, 13 of them strong (G3 or above); the strongest reached Kp 9. Every storm with its dates, and the Kp of every day of the year.

66Every storm

13G3–G5

Kp 9Peak Kp

88days at Kp 5 or more

The year day by day

the day's highest Kp

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Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Kp 0–3Kp 4Kp 5 · G1Kp 6 · G2Kp 7 · G3Kp 8 · G4Kp 9 · G5

Every storm · 1940

10Jan

2Feb

6Mar

3Apr

4May

7Jun

6Jul

4Aug

5Sep

6Oct

7Nov

6Dec

Date	Level	Peak Kp	Hours at Kp 5 or more	ap
3 January 1940	G4	Kp 8−	9	179
4 – 5 January 1940	G1	Kp 5	6	48
7 January 1940	G1	Kp 5	3	48
9 January 1940	G1	Kp 5−	3	39
10 January 1940	G2	Kp 6−	9	67
11 – 12 January 1940	G1	Kp 5	6	48
12 January 1940	G1	Kp 5−	3	39
17 January 1940	G1	Kp 5	3	48
18 January 1940	G3	Kp 7−	9	111
31 January – 1 February 1940	G1	Kp 5	27	48
20 February 1940	G1	Kp 5	3	48
25 February 1940	G1	Kp 5	15	48
9 March 1940	G2	Kp 6+	6	94
12 March 1940	G1	Kp 5	3	48
19 – 20 March 1940	G1	Kp 5−	9	39
23 – 27 March 1940	G5	Kp 9	75	400
28 March 1940	G1	Kp 5+	3	56
29 March – 1 April 1940	G4	Kp 9−	81	300
2 – 3 April 1940	G4	Kp 8	27	207
22 April 1940	G1	Kp 5−	3	39
25 – 26 April 1940	G4	Kp 8	27	207
18 May 1940	G2	Kp 6−	12	67
22 May 1940	G2	Kp 6−	9	67
23 – 24 May 1940	G4	Kp 8−	24	179
26 – 27 May 1940	G2	Kp 6−	6	67
6 June 1940	G1	Kp 5+	9	56
7 June 1940	G1	Kp 5+	6	56
7 June 1940	G1	Kp 5−	3	39
14 – 15 June 1940	G2	Kp 6+	18	94
18 June 1940	G1	Kp 5	3	48
25 – 26 June 1940	G4	Kp 8+	27	236
26 June 1940	G2	Kp 6−	3	67
3 – 4 July 1940	G1	Kp 5	6	48
4 July 1940	G1	Kp 5	3	48
10 July 1940	G1	Kp 5	3	48
13 – 14 July 1940	G4	Kp 8−	15	179
22 July 1940	G1	Kp 5−	3	39
30 July 1940	G1	Kp 5−	3	39
2 August 1940	G1	Kp 5+	3	56
3 August 1940	G2	Kp 6+	6	94
9 August 1940	G2	Kp 6+	9	94
26 August 1940	G2	Kp 6−	3	67
1 September 1940	G1	Kp 5	3	48
7 September 1940	G1	Kp 5+	6	56
14 September 1940	G1	Kp 5+	3	56
26 – 27 September 1940	G4	Kp 8−	15	179
27 – 28 September 1940	G2	Kp 6−	21	67
1 October 1940	G3	Kp 7	6	132
3 October 1940	G1	Kp 5−	3	39
7 – 8 October 1940	G3	Kp 7	33	132
22 October 1940	G1	Kp 5−	3	39
25 October 1940	G1	Kp 5−	3	39
26 October 1940	G1	Kp 5+	9	56
4 November 1940	G1	Kp 5−	3	39
12 – 13 November 1940	G3	Kp 7−	15	111
17 November 1940	G1	Kp 5−	3	39
21 November 1940	G1	Kp 5−	6	39
22 – 23 November 1940	G1	Kp 5+	18	56
25 – 26 November 1940	G2	Kp 6+	18	94
29 November 1940	G1	Kp 5+	18	56
2 December 1940	G1	Kp 5	3	48
20 – 21 December 1940	G2	Kp 6	21	80
22 December 1940	G1	Kp 5	3	48
28 – 29 December 1940	G1	Kp 5−	6	39
30 December 1940	G2	Kp 6+	6	94
31 December 1940	G1	Kp 5−	3	39