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Geomagnetic storm on 25 Sep 1998 (G4)
Max Kp8+G4
Ap117No. 2 in 1998
Consecutive G1+ days2
Ap rank112since 1932
Kp by 3-hour slot (UTC)
8-
8o
8+
7o
6+
6-
3-
2+
The days around it
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 22 Sep 1998 | 3+ | 7 | – |
| 23 Sep 1998 | 3o | 11 | – |
| 24 Sep 1998 | 6o | 28 | G2 |
| 25 Sep 1998 | 8+ | 117 | G4 |
| 26 Sep 1998 | 4+ | 17 | – |
| 27 Sep 1998 | 3+ | 10 | – |
| 28 Sep 1998 | 2o | 4 | – |
Highest-Ap days of 1998
144
117
101
75
66
64
64
63
62
62
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 117: No. 112 of 34,615 days since 1932 by Ap.