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Geomagnetic activity in September 2026
Mean Ap7.5No. 970 of 1138
G1+ days2
G3+ days0
Max Ap288 Sep 2026
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 7 Sep 2026 | 5- | 18 | G1 |
| 8 Sep 2026 | 5o | 28 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 2025 | 13.9 | 8 | 2 |
| September 2026 | 7.5 | 2 | 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 7.5 in September 2026, No. 970 of 1138 months since 1932; 2 days reached G1 or higher.