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Geomagnetic activity in September 1979
Mean Ap13.7No. 454 of 1138
G1+ days4
G3+ days1
Max Ap6418 Sep 1979
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 18 Sep 1979 | 7o | 64 | G3 |
| 20 Sep 1979 | 5o | 22 | G1 |
| 21 Sep 1979 | 5+ | 23 | G1 |
| 27 Sep 1979 | 5- | 15 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 1978 | 18.4 | 9 | 1 |
| September 1979 | 13.7 | 4 | 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 13.7 in September 1979, No. 454 of 1138 months since 1932; 4 days reached G1 or higher.