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Geomagnetic activity in January 1981
Mean Ap9.0No. 844 of 1138
G1+ days2
G3+ days0
Max Ap2231 Jan 1981
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 11 Jan 1981 | 5- | 19 | G1 |
| 31 Jan 1981 | 5o | 22 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| January 1980 | 10.4 | 5 | 0 |
| January 1981 | 9.0 | 2 | 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.
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About this page
Mean Ap 9.0 in January 1981, No. 844 of 1138 months since 1932; 2 days reached G1 or higher.