Aurora & Space WeatherHome › Geomagnetic history › 1970
Geomagnetic activity in April 1970
Mean Ap15.6No. 322 of 1138
G1+ days8
G3+ days2
Max Ap9021 Apr 1970
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 6 Apr 1970 | 5o | 23 | G1 |
| 9 Apr 1970 | 5- | 18 | G1 |
| 17 Apr 1970 | 5+ | 29 | G1 |
| 18 Apr 1970 | 5+ | 18 | G1 |
| 19 Apr 1970 | 5o | 21 | G1 |
| 20 Apr 1970 | 5- | 21 | G1 |
| 21 Apr 1970 | 8+ | 90 | G4 |
| 22 Apr 1970 | 7o | 41 | G3 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| April 1969 | 14.1 | 7 | 1 |
| April 1970 | 15.6 | 8 | 2 |
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 15.6 in April 1970, No. 322 of 1138 months since 1932; 8 days reached G1 or higher.