Home › Geomagnetic history › 1939

Geomagnetic storm on 17 Apr 1939 (G4)

Max Kp8oG4

Ap135No. 1 in 1939

Consecutive G1+ days4

Ap rank67since 1932

Kp by 3-hour slot (UTC)

00–036-

03–067+

06–098o

09–127-

12–158-

15–187+

18–217-

21–246+

The days around it

Date	Max Kp	Ap	Level
14 Apr 1939	3-	9	–
15 Apr 1939	2o	5	–
16 Apr 1939	3o	4	–
17 Apr 1939	8o	135	G4
18 Apr 1939	6o	42	G2
19 Apr 1939	7-	45	G3
20 Apr 1939	5o	27	G1

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.

← 28 Mar 1939 19 Apr 1939 →

About this page

Max Kp 8o, Ap 135: No. 67 of 34,615 days since 1932 by Ap.