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Geomagnetic activity in August 1990
Mean Ap18.7No. 190 of 1138
G1+ days12
G3+ days2
Max Ap7723 Aug 1990
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 1 Aug 1990 | 5o | 26 | G1 |
| 14 Aug 1990 | 5+ | 19 | G1 |
| 15 Aug 1990 | 5o | 26 | G1 |
| 16 Aug 1990 | 5- | 25 | G1 |
| 20 Aug 1990 | 5- | 19 | G1 |
| 21 Aug 1990 | 6o | 38 | G2 |
| 22 Aug 1990 | 6- | 49 | G2 |
| 23 Aug 1990 | 7o | 77 | G3 |
| 24 Aug 1990 | 5+ | 24 | G1 |
| 26 Aug 1990 | 7- | 63 | G3 |
| 30 Aug 1990 | 5+ | 26 | G1 |
| 31 Aug 1990 | 5- | 16 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| August 1989 | 19.7 | 14 | 4 |
| August 1990 | 18.7 | 12 | 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 18.7 in August 1990, No. 190 of 1138 months since 1932; 12 days reached G1 or higher.