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Geomagnetic activity in September 1989
Mean Ap17.1No. 244 of 1138
G1+ days9
G3+ days3
Max Ap7019 Sep 1989
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 4 Sep 1989 | 6o | 30 | G2 |
| 5 Sep 1989 | 5+ | 21 | G1 |
| 7 Sep 1989 | 6- | 22 | G2 |
| 15 Sep 1989 | 6+ | 42 | G2 |
| 16 Sep 1989 | 6- | 24 | G2 |
| 18 Sep 1989 | 8- | 52 | G4 |
| 19 Sep 1989 | 8o | 70 | G4 |
| 22 Sep 1989 | 5- | 23 | G1 |
| 26 Sep 1989 | 7o | 54 | G3 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 1988 | 12.2 | 6 | 0 |
| September 1989 | 17.1 | 9 | 3 |
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
Mean Ap 17.1 in September 1989, No. 244 of 1138 months since 1932; 9 days reached G1 or higher.