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Geomagnetic storm on 13 Apr 1938 (G3)

Max Kp7-G3

Ap36No. 31 in 1938

Consecutive G1+ days4

Ap rank1,948since 1932

Kp by 3-hour slot (UTC)

00–032+

03–062-

06–092+

09–124+

12–155o

15–185o

18–214o

21–247-

The days around it

Date	Max Kp	Ap	Level
10 Apr 1938	3o	9	–
11 Apr 1938	5-	16	G1
12 Apr 1938	4-	12	–
13 Apr 1938	7-	36	G3
14 Apr 1938	7o	60	G3
15 Apr 1938	5-	19	G1
16 Apr 1938	9o	136	G5

Highest-Ap days of 1938

16 Apr 1938136

22 Jan 1938128

17 Jan 1938120

25 Jan 1938107

11 May 1938103

15 Sep 1938100

12 May 193876

15 Jul 193867

7 Oct 193867

26 Jan 193862

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.

← 6 Feb 1938 14 Apr 1938 →

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Max Kp 7-, Ap 36: No. 1,948 of 34,615 days since 1932 by Ap.