Aurora & Space WeatherHome › Geomagnetic history › 1941
Geomagnetic activity in September 1941
Mean Ap26.7No. 46 of 1138
G1+ days13
G3+ days2
Max Ap23218 Sep 1941
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 7 Sep 1941 | 5o | 20 | G1 |
| 13 Sep 1941 | 6- | 24 | G2 |
| 14 Sep 1941 | 5- | 24 | G1 |
| 15 Sep 1941 | 5+ | 26 | G1 |
| 16 Sep 1941 | 6- | 20 | G2 |
| 18 Sep 1941 | 9- | 232 | G5 |
| 19 Sep 1941 | 9o | 176 | G5 |
| 20 Sep 1941 | 6+ | 36 | G2 |
| 21 Sep 1941 | 6o | 30 | G2 |
| 23 Sep 1941 | 5- | 14 | G1 |
| 24 Sep 1941 | 6- | 27 | G2 |
| 25 Sep 1941 | 5+ | 22 | G1 |
| 29 Sep 1941 | 5- | 18 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 1940 | 14.0 | 6 | 2 |
| September 1941 | 26.7 | 13 | 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 26.7 in September 1941, No. 46 of 1138 months since 1932; 13 days reached G1 or higher.