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Geomagnetic activity in September 1988
Mean Ap12.2No. 565 of 1138
G1+ days6
G3+ days0
Max Ap5111 Sep 1988
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Sep 1988 | 5- | 21 | G1 |
| 11 Sep 1988 | 6o | 51 | G2 |
| 12 Sep 1988 | 6- | 20 | G2 |
| 18 Sep 1988 | 6o | 34 | G2 |
| 19 Sep 1988 | 5- | 23 | G1 |
| 22 Sep 1988 | 5- | 20 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 1987 | 19.3 | 14 | 0 |
| September 1988 | 12.2 | 6 | 0 |
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 12.2 in September 1988, No. 565 of 1138 months since 1932; 6 days reached G1 or higher.