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Geomagnetic activity in September 1997
Mean Ap9.8No. 774 of 1138
G1+ days5
G3+ days0
Max Ap263 Sep 1997
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 3 Sep 1997 | 6+ | 26 | G2 |
| 4 Sep 1997 | 5o | 16 | G1 |
| 10 Sep 1997 | 5- | 19 | G1 |
| 18 Sep 1997 | 5o | 20 | G1 |
| 21 Sep 1997 | 5o | 16 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 1996 | 14.9 | 10 | 0 |
| September 1997 | 9.8 | 5 | 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 9.8 in September 1997, No. 774 of 1138 months since 1932; 5 days reached G1 or higher.