Aurora & Space WeatherGeomagnetic activity in 1990
Mean Ap16.2
G1+104days
G3+20days
G50days
G1+ days by month
- January 1990
- February 1990
- March 1990
- April 1990
- May 1990
- June 1990
- July 1990
- August 1990
- September 1990
- October 1990
- November 1990
- December 1990
Nearby years (G1+ days)
83
71
56
59
123
104
141
107
108
125
100
Top 10 days by Ap
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 10 Apr 1990 | 8o | 124 | G4 |
| 28 Jul 1990 | 8- | 102 | G4 |
| 12 Apr 1990 | 8- | 99 | G4 |
| 12 Jun 1990 | 8+ | 89 | G4 |
| 14 Jun 1990 | 8- | 79 | G4 |
| 23 Aug 1990 | 7o | 77 | G3 |
| 21 Mar 1990 | 7+ | 76 | G3 |
| 29 Jul 1990 | 7o | 75 | G3 |
| 13 Jun 1990 | 8- | 70 | G4 |
| 30 Mar 1990 | 8o | 69 | G4 |
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
1990 had 104 G1+ storm days (No. 24 of 95 years) and 20 G3+ days.