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Geomagnetic activity in September 2023
Mean Ap14.2No. 407 of 1138
G1+ days9
G3+ days0
Max Ap4719 Sep 2023
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 2 Sep 2023 | 5+ | 37 | G1 |
| 3 Sep 2023 | 5+ | 23 | G1 |
| 12 Sep 2023 | 5+ | 23 | G1 |
| 13 Sep 2023 | 5- | 16 | G1 |
| 18 Sep 2023 | 5o | 30 | G1 |
| 19 Sep 2023 | 6+ | 47 | G2 |
| 24 Sep 2023 | 6- | 21 | G2 |
| 25 Sep 2023 | 5+ | 23 | G1 |
| 26 Sep 2023 | 5o | 28 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 2022 | 12.1 | 4 | 0 |
| September 2023 | 14.2 | 9 | 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 14.2 in September 2023, No. 407 of 1138 months since 1932; 9 days reached G1 or higher.