Aurora & Space WeatherHome › Geomagnetic history › 1955
Geomagnetic activity in September 1955
Mean Ap12.7No. 529 of 1138
G1+ days5
G3+ days1
Max Ap5430 Sep 1955
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 3 Sep 1955 | 5o | 17 | G1 |
| 5 Sep 1955 | 5- | 22 | G1 |
| 12 Sep 1955 | 5- | 17 | G1 |
| 29 Sep 1955 | 5o | 20 | G1 |
| 30 Sep 1955 | 7- | 54 | G3 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 1954 | 16.6 | 8 | 1 |
| September 1955 | 12.7 | 5 | 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 12.7 in September 1955, No. 529 of 1138 months since 1932; 5 days reached G1 or higher.