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Geomagnetic activity in September 2015
Mean Ap15.8No. 312 of 1138
G1+ days7
G3+ days2
Max Ap6011 Sep 2015
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 7 Sep 2015 | 6+ | 44 | G2 |
| 8 Sep 2015 | 6o | 24 | G2 |
| 9 Sep 2015 | 6o | 59 | G2 |
| 11 Sep 2015 | 7o | 60 | G3 |
| 14 Sep 2015 | 5- | 14 | G1 |
| 19 Sep 2015 | 5- | 16 | G1 |
| 20 Sep 2015 | 7o | 44 | G3 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 2014 | 9.8 | 2 | 0 |
| September 2015 | 15.8 | 7 | 2 |
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 15.8 in September 2015, No. 312 of 1138 months since 1932; 7 days reached G1 or higher.