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Geomagnetic storm on 28 Jul 1990 (G4)
Max Kp8-G4
Ap102No. 2 in 1990
Consecutive G1+ days2
Ap rank159since 1932
Kp by 3-hour slot (UTC)
3o
5-
6+
5o
7-
7+
8-
8-
The days around it
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 25 Jul 1990 | 1+ | 4 | – |
| 26 Jul 1990 | 5+ | 14 | G1 |
| 27 Jul 1990 | 3o | 9 | – |
| 28 Jul 1990 | 8- | 102 | G4 |
| 29 Jul 1990 | 7o | 75 | G3 |
| 30 Jul 1990 | 4o | 12 | – |
| 31 Jul 1990 | 3o | 6 | – |
Highest-Ap days of 1990
124
102
99
89
79
77
76
75
70
69
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
Max Kp 8-, Ap 102: No. 159 of 34,615 days since 1932 by Ap.