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Geomagnetic activity in February 1975
Mean Ap18.2No. 201 of 1138
G1+ days9
G3+ days0
Max Ap3810 Feb 1975
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Feb 1975 | 5o | 37 | G1 |
| 2 Feb 1975 | 5- | 23 | G1 |
| 10 Feb 1975 | 6- | 38 | G2 |
| 11 Feb 1975 | 5+ | 36 | G1 |
| 12 Feb 1975 | 5- | 35 | G1 |
| 13 Feb 1975 | 5o | 27 | G1 |
| 16 Feb 1975 | 5o | 30 | G1 |
| 23 Feb 1975 | 6o | 32 | G2 |
| 25 Feb 1975 | 5- | 20 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| February 1974 | 16.2 | 10 | 0 |
| February 1975 | 18.2 | 9 | 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 18.2 in February 1975, No. 201 of 1138 months since 1932; 9 days reached G1 or higher.