Aurora & Space WeatherHome › Geomagnetic history › 1975
Geomagnetic activity in July 1975
Mean Ap12.0No. 583 of 1138
G1+ days4
G3+ days1
Max Ap378 Jul 1975
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 8 Jul 1975 | 6o | 37 | G2 |
| 9 Jul 1975 | 7- | 35 | G3 |
| 11 Jul 1975 | 5o | 18 | G1 |
| 25 Jul 1975 | 6o | 33 | G2 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| July 1974 | 23.7 | 12 | 3 |
| July 1975 | 12.0 | 4 | 1 |
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 12.0 in July 1975, No. 583 of 1138 months since 1932; 4 days reached G1 or higher.