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Geomagnetic activity in May 1998
Mean Ap17.7No. 221 of 1138
G1+ days7
G3+ days4
Max Ap1014 May 1998
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 2 May 1998 | 7- | 63 | G3 |
| 3 May 1998 | 6o | 62 | G2 |
| 4 May 1998 | 9- | 101 | G5 |
| 5 May 1998 | 7- | 42 | G3 |
| 17 May 1998 | 5o | 12 | G1 |
| 29 May 1998 | 7- | 26 | G3 |
| 30 May 1998 | 5- | 18 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| May 1997 | 8.2 | 4 | 1 |
| May 1998 | 17.7 | 7 | 4 |
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 17.7 in May 1998, No. 221 of 1138 months since 1932; 7 days reached G1 or higher.