Aurora & Space WeatherHome › Geomagnetic history › 1965
Geomagnetic activity in September 1965
Mean Ap10.1No. 740 of 1138
G1+ days3
G3+ days0
Max Ap3516 Sep 1965
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 16 Sep 1965 | 5+ | 35 | G1 |
| 27 Sep 1965 | 5+ | 20 | G1 |
| 28 Sep 1965 | 6- | 27 | G2 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 1964 | 11.1 | 6 | 1 |
| September 1965 | 10.1 | 3 | 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 10.1 in September 1965, No. 740 of 1138 months since 1932; 3 days reached G1 or higher.