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Geomagnetic storm on 21 Jul 1939 (G3)
Max Kp7+G3
Ap36No. 35 in 1939
Consecutive G1+ days4
Ap rank1,950since 1932
Kp by 3-hour slot (UTC)
3-
2+
0+
5o
7+
4+
3o
3+
The days around it
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 18 Jul 1939 | 3o | 10 | – |
| 19 Jul 1939 | 5o | 12 | G1 |
| 20 Jul 1939 | 6o | 47 | G2 |
| 21 Jul 1939 | 7+ | 36 | G3 |
| 22 Jul 1939 | 5- | 21 | G1 |
| 23 Jul 1939 | 4o | 9 | – |
| 24 Jul 1939 | 3+ | 9 | – |
Highest-Ap days of 1939
135
133
94
92
89
89
88
79
74
73
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 7+, Ap 36: No. 1,950 of 34,615 days since 1932 by Ap.