Aurora & Space WeatherHome › Geomagnetic history › 1984
Geomagnetic activity in September 1984
Mean Ap23.6No. 82 of 1138
G1+ days10
G3+ days3
Max Ap11223 Sep 1984
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 4 Sep 1984 | 8- | 59 | G4 |
| 5 Sep 1984 | 7o | 63 | G3 |
| 9 Sep 1984 | 5- | 12 | G1 |
| 10 Sep 1984 | 5o | 25 | G1 |
| 19 Sep 1984 | 6o | 36 | G2 |
| 22 Sep 1984 | 5+ | 22 | G1 |
| 23 Sep 1984 | 7o | 112 | G3 |
| 24 Sep 1984 | 6o | 52 | G2 |
| 25 Sep 1984 | 6- | 43 | G2 |
| 26 Sep 1984 | 6- | 42 | G2 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| September 1983 | 14.5 | 8 | 0 |
| September 1984 | 23.6 | 10 | 3 |
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 23.6 in September 1984, No. 82 of 1138 months since 1932; 10 days reached G1 or higher.