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Geomagnetic activity in January 1975
Mean Ap15.4No. 340 of 1138
G1+ days9
G3+ days1
Max Ap447 Jan 1975
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 4 Jan 1975 | 5o | 32 | G1 |
| 6 Jan 1975 | 6+ | 26 | G2 |
| 7 Jan 1975 | 8- | 44 | G4 |
| 8 Jan 1975 | 5+ | 36 | G1 |
| 13 Jan 1975 | 5o | 32 | G1 |
| 14 Jan 1975 | 5o | 33 | G1 |
| 17 Jan 1975 | 5o | 29 | G1 |
| 18 Jan 1975 | 5- | 22 | G1 |
| 28 Jan 1975 | 5- | 12 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| January 1974 | 14.7 | 6 | 0 |
| January 1975 | 15.4 | 9 | 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.
← December 1974February 1975 →
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Mean Ap 15.4 in January 1975, No. 340 of 1138 months since 1932; 9 days reached G1 or higher.