Aurora & Space WeatherGeomagnetic activity in 1981
Mean Ap16.3
G1+97days
G3+16days
G50days
G1+ days by month
- January 1981
- February 1981
- March 1981
- April 1981
- May 1981
- June 1981
- July 1981
- August 1981
- September 1981
- October 1981
- November 1981
- December 1981
Nearby years (G1+ days)
72
66
111
88
58
97
159
140
139
83
71
Top 10 days by Ap
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 25 Jul 1981 | 8+ | 134 | G4 |
| 13 Apr 1981 | 8+ | 121 | G4 |
| 12 Apr 1981 | 7o | 96 | G3 |
| 5 Mar 1981 | 7+ | 81 | G3 |
| 26 Jul 1981 | 8o | 78 | G4 |
| 14 Oct 1981 | 8o | 73 | G4 |
| 22 Oct 1981 | 7o | 72 | G3 |
| 20 Oct 1981 | 7o | 67 | G3 |
| 26 Apr 1981 | 7+ | 62 | G3 |
| 11 May 1981 | 7- | 61 | G3 |
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
1981 had 97 G1+ storm days (No. 29 of 95 years) and 16 G3+ days.