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Geomagnetic storm on 22 Jan 1938 (G4)

Max Kp8+G4

Ap128No. 2 in 1938

Consecutive G1+ days7

Ap rank83since 1932

Kp by 3-hour slot (UTC)

00–036-

03–067+

06–098+

09–128+

12–157-

15–187o

18–215+

21–244+

The days around it

Date	Max Kp	Ap	Level
19 Jan 1938	5o	24	G1
20 Jan 1938	5-	25	G1
21 Jan 1938	6-	38	G2
22 Jan 1938	8+	128	G4
23 Jan 1938	4+	16	–
24 Jan 1938	4-	16	–
25 Jan 1938	9-	107	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.

← 17 Jan 1938 25 Jan 1938 →

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Max Kp 8+, Ap 128: No. 83 of 34,615 days since 1932 by Ap.