Aurora & Space WeatherHome › Geomagnetic history › 1989
Geomagnetic storm on 21 Oct 1989 (G4)
Max Kp8+G4
Ap146No. 3 in 1989
Consecutive G1+ days5
Ap rank51since 1932
Kp by 3-hour slot (UTC)
6+
7-
7o
8+
8-
7-
8o
6+
The days around it
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 18 Oct 1989 | 4+ | 17 | – |
| 19 Oct 1989 | 5+ | 24 | G1 |
| 20 Oct 1989 | 8+ | 112 | G4 |
| 21 Oct 1989 | 8+ | 146 | G4 |
| 22 Oct 1989 | 6+ | 51 | G2 |
| 23 Oct 1989 | 6- | 22 | G2 |
| 24 Oct 1989 | 4+ | 17 | – |
Highest-Ap days of 1989
246
158
146
112
109
78
77
76
71
70
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.
About this page
Max Kp 8+, Ap 146: No. 51 of 34,615 days since 1932 by Ap.