Aurora & Space WeatherHome › Geomagnetic history › 1957
Geomagnetic activity in July 1957
Mean Ap15.6No. 320 of 1138
G1+ days9
G3+ days3
Max Ap831 Jul 1957
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Jul 1957 | 7+ | 83 | G3 |
| 2 Jul 1957 | 8o | 55 | G4 |
| 3 Jul 1957 | 6- | 30 | G2 |
| 4 Jul 1957 | 5o | 12 | G1 |
| 5 Jul 1957 | 7+ | 56 | G3 |
| 6 Jul 1957 | 5- | 16 | G1 |
| 19 Jul 1957 | 5- | 25 | G1 |
| 22 Jul 1957 | 6- | 26 | G2 |
| 23 Jul 1957 | 5- | 11 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| July 1956 | 13.0 | 10 | 0 |
| July 1957 | 15.6 | 9 | 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 15.6 in July 1957, No. 320 of 1138 months since 1932; 9 days reached G1 or higher.