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Geomagnetic activity in January 1987
Mean Ap8.0No. 934 of 1138
G1+ days1
G3+ days0
Max Ap181 Jan 1987
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 29 Jan 1987 | 5- | 10 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| January 1986 | 13.5 | 8 | 0 |
| January 1987 | 8.0 | 1 | 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 1986February 1987 →
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Mean Ap 8.0 in January 1987, No. 934 of 1138 months since 1932; 1 days reached G1 or higher.