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Geomagnetic activity in September 1957
Mean Ap49.3No. 1 of 1138
G1+ days16
G3+ days9
Max Ap16423 Sep 1957
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Sep 1957 | 6- | 28 | G2 |
| 2 Sep 1957 | 8- | 102 | G4 |
| 3 Sep 1957 | 9- | 135 | G5 |
| 4 Sep 1957 | 9o | 145 | G5 |
| 5 Sep 1957 | 9- | 112 | G5 |
| 6 Sep 1957 | 6- | 36 | G2 |
| 13 Sep 1957 | 9- | 160 | G5 |
| 14 Sep 1957 | 6+ | 38 | G2 |
| 16 Sep 1957 | 5- | 12 | G1 |
| 21 Sep 1957 | 7+ | 74 | G3 |
| 22 Sep 1957 | 8+ | 104 | G4 |
| 23 Sep 1957 | 9- | 164 | G5 |
| 24 Sep 1957 | 5+ | 33 | G1 |
| 25 Sep 1957 | 5- | 18 | G1 |
| 29 Sep 1957 | 9- | 139 | G5 |
| 30 Sep 1957 | 6+ | 56 | G2 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 1956 | 17.6 | 9 | 2 |
| September 1957 | 49.3 | 16 | 9 |
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 49.3 in September 1957, No. 1 of 1138 months since 1932; 16 days reached G1 or higher.