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Geomagnetic activity in September 1986
Mean Ap16.6No. 267 of 1138
G1+ days9
G3+ days1
Max Ap8912 Sep 1986
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 11 Sep 1986 | 6- | 16 | G2 |
| 12 Sep 1986 | 9- | 89 | G5 |
| 13 Sep 1986 | 5- | 22 | G1 |
| 19 Sep 1986 | 5o | 21 | G1 |
| 20 Sep 1986 | 5o | 18 | G1 |
| 21 Sep 1986 | 5- | 11 | G1 |
| 23 Sep 1986 | 6o | 43 | G2 |
| 25 Sep 1986 | 5+ | 26 | G1 |
| 26 Sep 1986 | 5o | 27 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 1985 | 12.8 | 7 | 0 |
| September 1986 | 16.6 | 9 | 1 |
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 16.6 in September 1986, No. 267 of 1138 months since 1932; 9 days reached G1 or higher.