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Geomagnetic activity in April 1998
Mean Ap9.8No. 778 of 1138
G1+ days4
G3+ days0
Max Ap3524 Apr 1998
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 23 Apr 1998 | 5o | 15 | G1 |
| 24 Apr 1998 | 6- | 35 | G2 |
| 25 Apr 1998 | 5o | 26 | G1 |
| 26 Apr 1998 | 5o | 31 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| April 1997 | 10.2 | 7 | 1 |
| April 1998 | 9.8 | 4 | 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 9.8 in April 1998, No. 778 of 1138 months since 1932; 4 days reached G1 or higher.