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Geomagnetic storm on 17 Sep 1939 (G3)

Max Kp7oG3

Ap55No. 19 in 1939

Consecutive G1+ days1

Ap rank717since 1932

Kp by 3-hour slot (UTC)

00–033-

03–065+

06–095o

09–124-

12–155-

15–186o

18–217o

21–245o

The days around it

Date	Max Kp	Ap	Level
14 Sep 1939	3+	12	–
15 Sep 1939	3-	6	–
16 Sep 1939	3-	7	–
17 Sep 1939	7o	55	G3
18 Sep 1939	3+	8	–
19 Sep 1939	5+	33	G1
20 Sep 1939	5+	33	G1

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.

← 23 Aug 1939 4 Oct 1939 →

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Max Kp 7o, Ap 55: No. 717 of 34,615 days since 1932 by Ap.