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Geomagnetic activity in July 1990
Mean Ap13.6No. 458 of 1138
G1+ days4
G3+ days2
Max Ap10228 Jul 1990
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 19 Jul 1990 | 5- | 16 | G1 |
| 26 Jul 1990 | 5+ | 14 | G1 |
| 28 Jul 1990 | 8- | 102 | G4 |
| 29 Jul 1990 | 7o | 75 | G3 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| July 1989 | 7.7 | 2 | 0 |
| July 1990 | 13.6 | 4 | 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 13.6 in July 1990, No. 458 of 1138 months since 1932; 4 days reached G1 or higher.