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Geomagnetic storm on 28 Sep 1938 (G4)

Max Kp8-G4

Ap56No. 13 in 1938

Consecutive G1+ days3

Ap rank695since 1932

Kp by 3-hour slot (UTC)

00–038-

03–067o

06–095o

09–124-

12–154o

15–183+

18–213+

21–242o

The days around it

Date	Max Kp	Ap	Level
25 Sep 1938	2+	4	–
26 Sep 1938	5+	38	G1
27 Sep 1938	7o	30	G3
28 Sep 1938	8-	56	G4
29 Sep 1938	4+	16	–
30 Sep 1938	7-	32	G3
1 Oct 1938	7+	45	G3

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.

← 27 Sep 1938 30 Sep 1938 →

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Max Kp 8-, Ap 56: No. 695 of 34,615 days since 1932 by Ap.