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Geomagnetic activity in September 1945
Mean Ap9.7No. 784 of 1138
G1+ days6
G3+ days0
Max Ap4318 Sep 1945
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 4 Sep 1945 | 5- | 19 | G1 |
| 12 Sep 1945 | 5- | 14 | G1 |
| 17 Sep 1945 | 5+ | 39 | G1 |
| 18 Sep 1945 | 6+ | 43 | G2 |
| 19 Sep 1945 | 5+ | 13 | G1 |
| 27 Sep 1945 | 5- | 12 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 1944 | 10.3 | 4 | 0 |
| September 1945 | 9.7 | 6 | 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 9.7 in September 1945, No. 784 of 1138 months since 1932; 6 days reached G1 or higher.