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Geomagnetic storm on 12 Aug 1991 (G3)

Max Kp7+G3

Ap64No. 24 in 1991

Consecutive G1+ days2

Ap rank512since 1932

Kp by 3-hour slot (UTC)

00–033-

03–063+

06–095-

09–124o

12–157+

15–186-

18–217+

21–245-

The days around it

Date	Max Kp	Ap	Level
9 Aug 1991	4+	15	–
10 Aug 1991	3o	8	–
11 Aug 1991	5-	24	G1
12 Aug 1991	7+	64	G3
13 Aug 1991	4-	8	–
14 Aug 1991	5+	19	G1
15 Aug 1991	5o	36	G1

Highest-Ap days of 1991

5 Jun 1991196

24 Mar 1991161

13 Jul 1991134

25 Mar 1991130

29 Oct 1991128

13 Jun 1991120

10 Jun 1991119

9 Nov 1991119

9 Jul 1991117

26 Mar 1991114

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.

← 14 Jul 1991 19 Aug 1991 →

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Max Kp 7+, Ap 64: No. 512 of 34,615 days since 1932 by Ap.