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Geomagnetic activity in September 2007
Mean Ap8.9No. 855 of 1138
G1+ days4
G3+ days0
Max Ap3029 Sep 2007
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 2 Sep 2007 | 5- | 24 | G1 |
| 27 Sep 2007 | 5o | 18 | G1 |
| 28 Sep 2007 | 5o | 24 | G1 |
| 29 Sep 2007 | 5o | 30 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 2006 | 7.8 | 4 | 0 |
| September 2007 | 8.9 | 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 8.9 in September 2007, No. 855 of 1138 months since 1932; 4 days reached G1 or higher.