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Geomagnetic storm on 25 Sep 1947 (G4)

Max Kp8-G4

Ap100No. 3 in 1947

Consecutive G1+ days4

Ap rank166since 1932

Kp by 3-hour slot (UTC)

00–038-

03–067+

06–097+

09–126o

12–156o

15–186-

18–215o

21–245-

The days around it

Date	Max Kp	Ap	Level
22 Sep 1947	5o	33	G1
23 Sep 1947	6+	42	G2
24 Sep 1947	7+	90	G3
25 Sep 1947	8-	100	G4
26 Sep 1947	4o	15	–
27 Sep 1947	4-	12	–
28 Sep 1947	3o	11	–

Highest-Ap days of 1947

3 Mar 1947128

17 Apr 1947100

25 Sep 1947100

8 Mar 194790

24 Sep 194790

3 Sep 194784

4 Mar 194782

2 Mar 194781

18 Jul 194780

28 Mar 194775

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.

← 24 Sep 1947 2 Oct 1947 →

About this page

Max Kp 8-, Ap 100: No. 166 of 34,615 days since 1932 by Ap.