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Geomagnetic storm on 18 Sep 1989 (G4)

Max Kp8-G4

Ap52No. 17 in 1989

Consecutive G1+ days2

Ap rank840since 1932

Kp by 3-hour slot (UTC)

00–034+

03–063-

06–094-

09–124o

12–153o

15–185o

18–216o

21–248-

The days around it

Date	Max Kp	Ap	Level
15 Sep 1989	6+	42	G2
16 Sep 1989	6-	24	G2
17 Sep 1989	3o	7	–
18 Sep 1989	8-	52	G4
19 Sep 1989	8o	70	G4
20 Sep 1989	2+	6	–
21 Sep 1989	3-	8	–

Highest-Ap days of 1989

13 Mar 1989246

14 Mar 1989158

21 Oct 1989146

20 Oct 1989112

17 Nov 1989109

10 Jun 198978

15 Aug 198977

26 Apr 198976

29 Mar 198971

19 Sep 198970

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.

← 29 Aug 1989 19 Sep 1989 →

About this page

Max Kp 8-, Ap 52: No. 840 of 34,615 days since 1932 by Ap.