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Geomagnetic storm on 12 Jun 1990 (G4)

Max Kp8+G4

Ap89No. 4 in 1990

Consecutive G1+ days3

Ap rank228since 1932

Kp by 3-hour slot (UTC)

00–034o

03–063o

06–094+

09–124+

12–155+

15–187o

18–218-

21–248+

The days around it

Date	Max Kp	Ap	Level
9 Jun 1990	6-	32	G2
10 Jun 1990	5-	17	G1
11 Jun 1990	3o	11	–
12 Jun 1990	8+	89	G4
13 Jun 1990	8-	70	G4
14 Jun 1990	8-	79	G4
15 Jun 1990	4-	9	–

Highest-Ap days of 1990

10 Apr 1990124

28 Jul 1990102

12 Apr 199099

12 Jun 199089

14 Jun 199079

23 Aug 199077

21 Mar 199076

29 Jul 199075

13 Jun 199070

30 Mar 199069

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 May 1990 13 Jun 1990 →

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Max Kp 8+, Ap 89: No. 228 of 34,615 days since 1932 by Ap.