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Geomagnetic activity in September 2001
Mean Ap12.6No. 541 of 1138
G1+ days6
G3+ days1
Max Ap4123 Sep 2001
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 13 Sep 2001 | 5- | 18 | G1 |
| 23 Sep 2001 | 6o | 41 | G2 |
| 25 Sep 2001 | 7+ | 33 | G3 |
| 26 Sep 2001 | 6- | 26 | G2 |
| 29 Sep 2001 | 5+ | 28 | G1 |
| 30 Sep 2001 | 6- | 29 | G2 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 2000 | 17.7 | 9 | 2 |
| September 2001 | 12.6 | 6 | 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 12.6 in September 2001, No. 541 of 1138 months since 1932; 6 days reached G1 or higher.