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Geomagnetic activity in January 1990
Mean Ap13.8No. 447 of 1138
G1+ days5
G3+ days0
Max Ap3224 Jan 1990
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 3 Jan 1990 | 5o | 15 | G1 |
| 24 Jan 1990 | 5o | 32 | G1 |
| 25 Jan 1990 | 5o | 19 | G1 |
| 29 Jan 1990 | 5- | 24 | G1 |
| 30 Jan 1990 | 5o | 24 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| January 1989 | 18.7 | 11 | 1 |
| January 1990 | 13.8 | 5 | 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.
← December 1989February 1990 →
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Mean Ap 13.8 in January 1990, No. 447 of 1138 months since 1932; 5 days reached G1 or higher.