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Geomagnetic activity in April 1964
Mean Ap13.3No. 481 of 1138
G1+ days9
G3+ days1
Max Ap461 Apr 1964
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Apr 1964 | 7+ | 46 | G3 |
| 2 Apr 1964 | 5+ | 26 | G1 |
| 11 Apr 1964 | 5- | 14 | G1 |
| 18 Apr 1964 | 5o | 21 | G1 |
| 19 Apr 1964 | 5- | 22 | G1 |
| 27 Apr 1964 | 5+ | 26 | G1 |
| 28 Apr 1964 | 5+ | 33 | G1 |
| 29 Apr 1964 | 5o | 16 | G1 |
| 30 Apr 1964 | 5- | 11 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| April 1963 | 9.8 | 5 | 0 |
| April 1964 | 13.3 | 9 | 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 13.3 in April 1964, No. 481 of 1138 months since 1932; 9 days reached G1 or higher.