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Geomagnetic activity in August 1958
Mean Ap17.7No. 219 of 1138
G1+ days6
G3+ days3
Max Ap8524 Aug 1958
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 17 Aug 1958 | 7+ | 82 | G3 |
| 18 Aug 1958 | 5o | 20 | G1 |
| 22 Aug 1958 | 6- | 34 | G2 |
| 24 Aug 1958 | 8- | 85 | G4 |
| 25 Aug 1958 | 5- | 18 | G1 |
| 27 Aug 1958 | 7- | 64 | G3 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| August 1957 | 13.6 | 9 | 3 |
| August 1958 | 17.7 | 6 | 3 |
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 August 1958, No. 219 of 1138 months since 1932; 6 days reached G1 or higher.