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Geomagnetic activity in December 1964
Mean Ap5.3No. 1094 of 1138
G1+ days2
G3+ days0
Max Ap1516 Dec 1964
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 16 Dec 1964 | 5+ | 15 | G1 |
| 17 Dec 1964 | 5- | 15 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| December 1963 | 10.5 | 4 | 0 |
| December 1964 | 5.3 | 2 | 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 5.3 in December 1964, No. 1094 of 1138 months since 1932; 2 days reached G1 or higher.