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Geomagnetic storm on 12 Apr 1990 (G4)

Max Kp8-G4

Ap99No. 3 in 1990

Consecutive G1+ days7

Ap rank172since 1932

Kp by 3-hour slot (UTC)

00–034+

03–068-

06–097+

09–126+

12–157-

15–185+

18–217-

21–245+

The days around it

Date	Max Kp	Ap	Level
9 Apr 1990	6-	34	G2
10 Apr 1990	8o	124	G4
11 Apr 1990	7-	64	G3
12 Apr 1990	8-	99	G4
13 Apr 1990	5+	38	G1
14 Apr 1990	6o	45	G2
15 Apr 1990	5o	24	G1

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.

← 11 Apr 1990 26 May 1990 →

About this page

Max Kp 8-, Ap 99: No. 172 of 34,615 days since 1932 by Ap.