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Geomagnetic activity in April 1987
Mean Ap7.0No. 1007 of 1138
G1+ days1
G3+ days0
Max Ap164 Apr 1987
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 4 Apr 1987 | 5- | 16 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| April 1986 | 7.9 | 1 | 0 |
| April 1987 | 7.0 | 1 | 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 7.0 in April 1987, No. 1007 of 1138 months since 1932; 1 days reached G1 or higher.