Aurora & Space WeatherHome › Geomagnetic history › 2012
Geomagnetic activity in September 2012
Mean Ap8.1No. 923 of 1138
G1+ days4
G3+ days0
Max Ap325 Sep 2012
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 2 Sep 2012 | 5- | 16 | G1 |
| 3 Sep 2012 | 6- | 31 | G2 |
| 5 Sep 2012 | 6- | 32 | G2 |
| 19 Sep 2012 | 5- | 14 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 2011 | 12.3 | 9 | 0 |
| September 2012 | 8.1 | 4 | 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 8.1 in September 2012, No. 923 of 1138 months since 1932; 4 days reached G1 or higher.