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Geomagnetic activity in September 1972
Mean Ap12.9No. 511 of 1138
G1+ days5
G3+ days2
Max Ap5414 Sep 1972
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 13 Sep 1972 | 7+ | 53 | G3 |
| 14 Sep 1972 | 8o | 54 | G4 |
| 15 Sep 1972 | 5o | 24 | G1 |
| 17 Sep 1972 | 5o | 26 | G1 |
| 29 Sep 1972 | 5o | 25 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 1971 | 12.8 | 7 | 1 |
| September 1972 | 12.9 | 5 | 2 |
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 12.9 in September 1972, No. 511 of 1138 months since 1932; 5 days reached G1 or higher.