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Geomagnetic storm on 12 Aug 1939 (G4)

Max Kp8-G4

Ap88No. 7 in 1939

Consecutive G1+ days4

Ap rank229since 1932

Kp by 3-hour slot (UTC)

00–036o

03–068-

06–097+

09–127-

12–155o

15–184-

18–215-

21–246-

The days around it

Date	Max Kp	Ap	Level
9 Aug 1939	1+	2	–
10 Aug 1939	5-	13	G1
11 Aug 1939	6-	16	G2
12 Aug 1939	8-	88	G4
13 Aug 1939	6o	34	G2
14 Aug 1939	4-	9	–
15 Aug 1939	3-	5	–

Highest-Ap days of 1939

17 Apr 1939135

22 Aug 1939133

5 Jul 193994

23 Apr 193992

23 Aug 193989

13 Oct 193989

12 Aug 193988

24 Apr 193979

14 Oct 193974

25 Feb 193973

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.

← 21 Jul 1939 16 Aug 1939 →

About this page

Max Kp 8-, Ap 88: No. 229 of 34,615 days since 1932 by Ap.