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Geomagnetic storm on 13 Oct 1939 (G4)

Max Kp8oG4

Ap89No. 6 in 1939

Consecutive G1+ days7

Ap rank224since 1932

Kp by 3-hour slot (UTC)

00–035o

03–066-

06–096+

09–124o

12–154-

15–186-

18–218-

21–248o

The days around it

Date	Max Kp	Ap	Level
10 Oct 1939	2+	5	–
11 Oct 1939	3+	11	–
12 Oct 1939	3o	4	–
13 Oct 1939	8o	89	G4
14 Oct 1939	7-	74	G3
15 Oct 1939	8o	68	G4
16 Oct 1939	6-	35	G2

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.

← 9 Oct 1939 14 Oct 1939 →

About this page

Max Kp 8o, Ap 89: No. 224 of 34,615 days since 1932 by Ap.