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Geomagnetic activity in May 1958
Mean Ap17.5No. 229 of 1138
G1+ days8
G3+ days2
Max Ap7231 May 1958
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 13 May 1958 | 6- | 29 | G2 |
| 14 May 1958 | 6- | 38 | G2 |
| 15 May 1958 | 5o | 27 | G1 |
| 26 May 1958 | 7- | 39 | G3 |
| 27 May 1958 | 5o | 24 | G1 |
| 28 May 1958 | 5- | 18 | G1 |
| 29 May 1958 | 6+ | 52 | G2 |
| 31 May 1958 | 8o | 72 | G4 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| May 1957 | 10.7 | 3 | 0 |
| May 1958 | 17.5 | 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 17.5 in May 1958, No. 229 of 1138 months since 1932; 8 days reached G1 or higher.