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Geomagnetic activity in September 2003
Mean Ap18.3No. 199 of 1138
G1+ days8
G3+ days1
Max Ap7017 Sep 2003
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 9 Sep 2003 | 5- | 22 | G1 |
| 10 Sep 2003 | 5o | 21 | G1 |
| 16 Sep 2003 | 6- | 34 | G2 |
| 17 Sep 2003 | 7o | 70 | G3 |
| 18 Sep 2003 | 6o | 50 | G2 |
| 19 Sep 2003 | 5+ | 39 | G1 |
| 20 Sep 2003 | 5- | 27 | G1 |
| 24 Sep 2003 | 6- | 41 | G2 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 2002 | 13.0 | 7 | 2 |
| September 2003 | 18.3 | 8 | 1 |
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 18.3 in September 2003, No. 199 of 1138 months since 1932; 8 days reached G1 or higher.