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Geomagnetic storm on 12 May 1938 (G3)

Max Kp7+G3

Ap76No. 7 in 1938

Consecutive G1+ days5

Ap rank342since 1932

Kp by 3-hour slot (UTC)

00–037+

03–067-

06–096+

09–124o

12–154+

15–185-

18–215-

21–247-

The days around it

Date	Max Kp	Ap	Level
9 May 1938	3o	5	–
10 May 1938	3+	8	–
11 May 1938	9-	103	G5
12 May 1938	7+	76	G3
13 May 1938	6+	17	G2
14 May 1938	6+	40	G2
15 May 1938	5+	24	G1

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.

← 11 May 1938 15 Jul 1938 →

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Max Kp 7+, Ap 76: No. 342 of 34,615 days since 1932 by Ap.