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Geomagnetic activity in September 2017
Mean Ap18.1No. 203 of 1138
G1+ days11
G3+ days3
Max Ap1068 Sep 2017
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 2 Sep 2017 | 5- | 20 | G1 |
| 4 Sep 2017 | 5- | 16 | G1 |
| 7 Sep 2017 | 8- | 36 | G4 |
| 8 Sep 2017 | 8+ | 106 | G4 |
| 12 Sep 2017 | 5+ | 17 | G1 |
| 13 Sep 2017 | 5+ | 14 | G1 |
| 14 Sep 2017 | 5+ | 22 | G1 |
| 15 Sep 2017 | 6- | 34 | G2 |
| 16 Sep 2017 | 5+ | 28 | G1 |
| 27 Sep 2017 | 6+ | 37 | G2 |
| 28 Sep 2017 | 7- | 51 | G3 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 2016 | 14.5 | 8 | 0 |
| September 2017 | 18.1 | 11 | 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 18.1 in September 2017, No. 203 of 1138 months since 1932; 11 days reached G1 or higher.