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Geomagnetic activity in September 2008
Mean Ap5.6No. 1077 of 1138
G1+ days1
G3+ days0
Max Ap314 Sep 2008
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 4 Sep 2008 | 6o | 31 | G2 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 2007 | 8.9 | 4 | 0 |
| September 2008 | 5.6 | 1 | 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 5.6 in September 2008, No. 1077 of 1138 months since 1932; 1 days reached G1 or higher.