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Geomagnetic activity in May 1957
Mean Ap10.7No. 687 of 1138
G1+ days3
G3+ days0
Max Ap2826 May 1957
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 9 May 1957 | 5- | 22 | G1 |
| 26 May 1957 | 5o | 28 | G1 |
| 30 May 1957 | 5+ | 28 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| May 1956 | 25.5 | 13 | 6 |
| May 1957 | 10.7 | 3 | 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 10.7 in May 1957, No. 687 of 1138 months since 1932; 3 days reached G1 or higher.