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Geomagnetic activity in September 1964
Mean Ap11.1No. 657 of 1138
G1+ days6
G3+ days1
Max Ap4422 Sep 1964
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Sep 1964 | 5- | 20 | G1 |
| 6 Sep 1964 | 5o | 12 | G1 |
| 7 Sep 1964 | 5o | 28 | G1 |
| 22 Sep 1964 | 8- | 44 | G4 |
| 28 Sep 1964 | 6- | 35 | G2 |
| 30 Sep 1964 | 5- | 22 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 1963 | 28.4 | 14 | 5 |
| September 1964 | 11.1 | 6 | 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 11.1 in September 1964, No. 657 of 1138 months since 1932; 6 days reached G1 or higher.