Home › Geomagnetic history › 1991

Geomagnetic storm on 28 Oct 1991 (G4)

Max Kp8+G4

Ap98No. 12 in 1991

Consecutive G1+ days11

Ap rank178since 1932

Kp by 3-hour slot (UTC)

00–035+

03–065+

06–095-

09–126+

12–158-

15–188+

18–215+

21–246-

The days around it

Date	Max Kp	Ap	Level
25 Oct 1991	5+	38	G1
26 Oct 1991	5o	32	G1
27 Oct 1991	6+	50	G2
28 Oct 1991	8+	98	G4
29 Oct 1991	8+	128	G4
30 Oct 1991	6-	34	G2
31 Oct 1991	7o	59	G3

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.

← 8 Oct 1991 29 Oct 1991 →

About this page

Max Kp 8+, Ap 98: No. 178 of 34,615 days since 1932 by Ap.