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Geomagnetic storm on 21 Mar 1990 (G3)

Max Kp7+G3

Ap76No. 7 in 1990

Consecutive G1+ days6

Ap rank348since 1932

Kp by 3-hour slot (UTC)

00–037+

03–066-

06–096+

09–126o

12–156-

15–185+

18–216-

21–244o

The days around it

Date	Max Kp	Ap	Level
18 Mar 1990	6-	35	G2
19 Mar 1990	6-	16	G2
20 Mar 1990	7-	30	G3
21 Mar 1990	7+	76	G3
22 Mar 1990	5-	28	G1
23 Mar 1990	5-	29	G1
24 Mar 1990	4-	18	–

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.

← 20 Mar 1990 30 Mar 1990 →

About this page

Max Kp 7+, Ap 76: No. 348 of 34,615 days since 1932 by Ap.