Aurora & Space WeatherGeomagnetic activity in 2021
Mean Ap7.2
G1+27days
G3+2days
G50days
G1+ days by month
- January 2021
- February 2021
- March 2021
- April 2021
- May 2021
- June 2021
- July 2021
- August 2021
- September 2021
- October 2021
- November 2021
- December 2021
Nearby years (G1+ days)
63
53
20
18
9
27
55
51
46
97
50
Top 10 days by Ap
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 4 Nov 2021 | 8- | 72 | G4 |
| 12 Oct 2021 | 6+ | 46 | G2 |
| 12 May 2021 | 7o | 42 | G3 |
| 17 Apr 2021 | 5- | 28 | G1 |
| 20 Mar 2021 | 6- | 27 | G2 |
| 1 Mar 2021 | 6- | 25 | G2 |
| 20 May 2021 | 5+ | 24 | G1 |
| 14 Mar 2021 | 5o | 23 | G1 |
| 17 Sep 2021 | 5+ | 23 | G1 |
| 21 Mar 2021 | 5- | 22 | G1 |
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
2021 had 27 G1+ storm days (No. 88 of 95 years) and 2 G3+ days.