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Geomagnetic activity in January 1991
Mean Ap8.5No. 895 of 1138
G1+ days3
G3+ days0
Max Ap2224 Jan 1991
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 12 Jan 1991 | 5o | 19 | G1 |
| 24 Jan 1991 | 5- | 22 | G1 |
| 25 Jan 1991 | 5- | 13 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| January 1990 | 13.8 | 5 | 0 |
| January 1991 | 8.5 | 3 | 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 1990February 1991 →
About this page
Mean Ap 8.5 in January 1991, No. 895 of 1138 months since 1932; 3 days reached G1 or higher.