Aurora & Space WeatherHome › Geomagnetic history › 1985
Geomagnetic activity in February 1985
Mean Ap15.2No. 347 of 1138
G1+ days7
G3+ days2
Max Ap6028 Feb 1985
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 5 Feb 1985 | 5- | 21 | G1 |
| 6 Feb 1985 | 6- | 46 | G2 |
| 8 Feb 1985 | 5- | 24 | G1 |
| 9 Feb 1985 | 5- | 19 | G1 |
| 10 Feb 1985 | 5o | 24 | G1 |
| 27 Feb 1985 | 7- | 19 | G3 |
| 28 Feb 1985 | 7o | 60 | G3 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| February 1984 | 16.7 | 10 | 0 |
| February 1985 | 15.2 | 7 | 2 |
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 15.2 in February 1985, No. 347 of 1138 months since 1932; 7 days reached G1 or higher.