Aurora & Space WeatherHome › Geomagnetic history › 1990
Geomagnetic activity in October 1990
Mean Ap14.6No. 383 of 1138
G1+ days9
G3+ days0
Max Ap4810 Oct 1990
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 4 Oct 1990 | 5- | 16 | G1 |
| 10 Oct 1990 | 6o | 48 | G2 |
| 11 Oct 1990 | 6- | 42 | G2 |
| 12 Oct 1990 | 5o | 31 | G1 |
| 15 Oct 1990 | 5- | 26 | G1 |
| 20 Oct 1990 | 5o | 23 | G1 |
| 24 Oct 1990 | 5o | 25 | G1 |
| 30 Oct 1990 | 6- | 20 | G2 |
| 31 Oct 1990 | 5- | 25 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| October 1989 | 21.1 | 8 | 2 |
| October 1990 | 14.6 | 9 | 0 |
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.
← September 1990November 1990 →
About this page
Mean Ap 14.6 in October 1990, No. 383 of 1138 months since 1932; 9 days reached G1 or higher.