Home › Geomagnetic history › 1939

Geomagnetic storm on 23 Aug 1939 (G4)

Max Kp8-G4

Ap89No. 5 in 1939

Consecutive G1+ days2

Ap rank223since 1932

Kp by 3-hour slot (UTC)

00–038-

03–067+

06–097-

09–127-

12–156o

15–184o

18–214o

21–244-

The days around it

Date	Max Kp	Ap	Level
20 Aug 1939	2+	6	–
21 Aug 1939	4o	9	–
22 Aug 1939	8-	133	G4
23 Aug 1939	8-	89	G4
24 Aug 1939	4o	13	–
25 Aug 1939	3+	10	–
26 Aug 1939	2+	6	–

Highest-Ap days of 1939

17 Apr 1939135

22 Aug 1939133

5 Jul 193994

23 Apr 193992

23 Aug 193989

13 Oct 193989

12 Aug 193988

24 Apr 193979

14 Oct 193974

25 Feb 193973

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.

← 22 Aug 1939 17 Sep 1939 →

About this page

Max Kp 8-, Ap 89: No. 223 of 34,615 days since 1932 by Ap.