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Geomagnetic storm on 20 Aug 1991 (G4)

Max Kp8-G4

Ap67No. 20 in 1991

Consecutive G1+ days5

Ap rank465since 1932

Kp by 3-hour slot (UTC)

00–033o

03–063-

06–095-

09–127+

12–158-

15–185-

18–215+

21–245-

The days around it

Date	Max Kp	Ap	Level
17 Aug 1991	4+	21	–
18 Aug 1991	6o	26	G2
19 Aug 1991	8-	74	G4
20 Aug 1991	8-	67	G4
21 Aug 1991	6o	41	G2
22 Aug 1991	7o	48	G3
23 Aug 1991	4o	13	–

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.

← 19 Aug 1991 22 Aug 1991 →

About this page

Max Kp 8-, Ap 67: No. 465 of 34,615 days since 1932 by Ap.