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Geomagnetic activity in September 1942
Mean Ap16.9No. 252 of 1138
G1+ days13
G3+ days1
Max Ap5412 Sep 1942
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 2 Sep 1942 | 5o | 17 | G1 |
| 6 Sep 1942 | 5o | 26 | G1 |
| 11 Sep 1942 | 6o | 25 | G2 |
| 12 Sep 1942 | 7- | 54 | G3 |
| 13 Sep 1942 | 5o | 24 | G1 |
| 14 Sep 1942 | 5o | 31 | G1 |
| 15 Sep 1942 | 5- | 26 | G1 |
| 16 Sep 1942 | 5o | 23 | G1 |
| 17 Sep 1942 | 5+ | 34 | G1 |
| 18 Sep 1942 | 5o | 26 | G1 |
| 20 Sep 1942 | 5+ | 25 | G1 |
| 21 Sep 1942 | 5+ | 38 | G1 |
| 22 Sep 1942 | 5- | 21 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 1941 | 26.7 | 13 | 2 |
| September 1942 | 16.9 | 13 | 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 16.9 in September 1942, No. 252 of 1138 months since 1932; 13 days reached G1 or higher.