Aurora & Space WeatherHome › Geomagnetic history › 1987
Geomagnetic storm on 29 Jul 1987 (G3)
Max Kp7oG3
Ap52No. 1 in 1987
Consecutive G1+ days2
Ap rank838since 1932
Kp by 3-hour slot (UTC)
7-
7o
5+
5o
5o
3-
1+
1o
The days around it
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 26 Jul 1987 | 2- | 4 | – |
| 27 Jul 1987 | 2o | 5 | – |
| 28 Jul 1987 | 5+ | 26 | G1 |
| 29 Jul 1987 | 7o | 52 | G3 |
| 30 Jul 1987 | 3+ | 9 | – |
| 31 Jul 1987 | 5o | 14 | G1 |
| 1 Aug 1987 | 4o | 10 | – |
Highest-Ap days of 1987
52
46
44
43
40
40
39
39
38
36
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 7o, Ap 52: No. 838 of 34,615 days since 1932 by Ap.