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Geomagnetic activity in April 1958
Mean Ap19.6No. 163 of 1138
G1+ days13
G3+ days0
Max Ap5417 Apr 1958
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 2 Apr 1958 | 5+ | 34 | G1 |
| 4 Apr 1958 | 6- | 36 | G2 |
| 5 Apr 1958 | 5+ | 26 | G1 |
| 6 Apr 1958 | 5o | 23 | G1 |
| 14 Apr 1958 | 5- | 20 | G1 |
| 15 Apr 1958 | 5o | 25 | G1 |
| 16 Apr 1958 | 5o | 32 | G1 |
| 17 Apr 1958 | 6o | 54 | G2 |
| 18 Apr 1958 | 5+ | 44 | G1 |
| 26 Apr 1958 | 5- | 13 | G1 |
| 28 Apr 1958 | 5- | 24 | G1 |
| 29 Apr 1958 | 5+ | 31 | G1 |
| 30 Apr 1958 | 5- | 29 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| April 1957 | 21.5 | 14 | 3 |
| April 1958 | 19.6 | 13 | 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 19.6 in April 1958, No. 163 of 1138 months since 1932; 13 days reached G1 or higher.