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Geomagnetic activity in April 1978
Mean Ap23.4No. 86 of 1138
G1+ days16
G3+ days5
Max Ap6411 Apr 1978
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 2 Apr 1978 | 5- | 15 | G1 |
| 3 Apr 1978 | 6o | 41 | G2 |
| 4 Apr 1978 | 7o | 55 | G3 |
| 5 Apr 1978 | 5+ | 21 | G1 |
| 10 Apr 1978 | 7+ | 36 | G3 |
| 11 Apr 1978 | 8- | 64 | G4 |
| 12 Apr 1978 | 7- | 29 | G3 |
| 13 Apr 1978 | 6- | 24 | G2 |
| 14 Apr 1978 | 6+ | 51 | G2 |
| 15 Apr 1978 | 5- | 19 | G1 |
| 18 Apr 1978 | 5- | 19 | G1 |
| 19 Apr 1978 | 6- | 38 | G2 |
| 20 Apr 1978 | 6- | 23 | G2 |
| 24 Apr 1978 | 6o | 48 | G2 |
| 25 Apr 1978 | 5- | 17 | G1 |
| 30 Apr 1978 | 8o | 58 | G4 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| April 1977 | 15.6 | 7 | 2 |
| April 1978 | 23.4 | 16 | 5 |
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 23.4 in April 1978, No. 86 of 1138 months since 1932; 16 days reached G1 or higher.