Top 50 solar flares of the year 2021
On this page you will find an overview of the strongest solar flares of the year 2021 together with links to more information in our archive and a video (if available) of the event.
| Region | Start | Maximum | End | ||||
|---|---|---|---|---|---|---|---|
| 1 | X1.59 | 2021/07/03 | 2838 | 14:18 | 14:29 | 14:34 | |
| 2 | X1 | 2021/10/28 | 2887 | 15:17 | 15:35 | 15:48 | |
| 3 | M4.79 | 2021/08/28 | 2860 | 05:39 | 06:11 | 06:23 | |
| 4 | M3.9 | 2021/05/07 | 2822 | 18:43 | 19:04 | 19:19 | |
| 5 | M2.8 | 2021/09/23 | 2871 | 04:35 | 04:42 | 04:50 | |
| 6 | M2.7 | 2021/07/03 | 2838 | 07:04 | 07:17 | 07:22 | |
| 7 | M2.2 | 2021/10/28 | 2887 | 10:19 | 10:28 | 10:37 | |
| 8 | M2 | 2021/11/09 | 2891 | 15:47 | 17:02 | 17:37 | |
| 9 | M1.9 | 2021/12/20 | 2908 | 11:12 | 11:36 | 11:55 | |
| 10 | M1.89 | 2021/12/28 | 2918 | 03:50 | 04:01 | 04:10 | |
| 11 | M1.89 | 2021/09/23 | 2871 | 15:23 | 15:28 | 15:39 | |
| 12 | M1.72 | 2021/11/02 | 2891 | 02:57 | 03:01 | 03:05 | |
| 13 | M1.67 | 2021/11/02 | 2891 | 02:03 | 02:51 | 02:57 | |
| 14 | M1.6 | 2021/12/28 | 2918 | 15:59 | 16:11 | 16:20 | |
| 15 | M1.6 | 2021/10/09 | 2882 | 06:19 | 06:38 | 06:53 | |
| 16 | M1.5 | 2021/11/01 | 2887 | 00:57 | 01:45 | 02:10 | |
| 17 | M1.5 | 2021/10/29 | 2891 | 02:22 | 02:42 | 02:53 | |
| 18 | M1.5 | 2021/07/04 | 2838 | 05:00 | 05:09 | 05:15 | |
| 19 | M1.42 | 2021/10/28 | 2887 | 07:30 | 07:40 | 07:45 | |
| 20 | M1.4 | 2021/12/21 | 2916 | 11:31 | 11:44 | 11:49 | |
| 21 | M1.4 | 2021/12/05 | 2898 | 06:58 | 07:19 | 07:36 | |
| 22 | M1.4 | 2021/05/22 | 2824 | 21:30 | 21:36 | 21:43 | |
| 23 | M1.3 | 2021/12/22 | 2908 | 06:54 | 07:06 | 07:21 | |
| 24 | M1.3 | 2021/10/26 | 02:40 | 02:47 | 02:54 | ||
| 25 | M1.29 | 2021/12/17 | 2911 | 00:39 | 00:51 | 00:56 | |
| 26 | M1.2 | 2021/05/23 | 2824 | 11:00 | 11:08 | 11:14 | |
| 27 | M1.1 | 2021/12/21 | 2916 | 07:43 | 07:50 | 07:57 | |
| 28 | M1.1 | 2021/05/22 | 2824 | 17:03 | 17:11 | 17:16 | |
| 29 | M1.1 | 2021/04/19 | 2816 | 23:19 | 23:42 | 23:59 | |
| 30 | M1 | 2021/10/26 | 2891 | 15:42 | 15:57 | 16:02 | |
| 31 | M1 | 2021/07/03 | 2838 | 16:59 | 17:03 | 17:14 | |
| 32 | C9.8 | 2021/12/31 | 2918 | 06:46 | 06:56 | 07:06 | |
| 33 | C9.5 | 2021/05/28 | 2824 | 22:19 | 23:13 | 00:12 | |
| 34 | C9.4 | 2021/10/26 | 00:48 | 01:04 | 01:13 | ||
| 35 | C9 | 2021/12/22 | 2907 | 17:54 | 18:08 | 18:26 | |
| 36 | C8.7 | 2021/05/08 | 2822 | 18:22 | 18:45 | 18:58 | |
| 37 | C8.6 | 2021/10/27 | 2887 | 05:47 | 06:08 | 06:20 | |
| 38 | C8.6 | 2021/04/22 | 2817 | 20:00 | 20:11 | 20:20 | |
| 39 | C8.5 | 2021/10/25 | 19:46 | 19:56 | 20:01 | ||
| 40 | C8.4 | 2021/09/08 | 2866 | 17:11 | 17:30 | 17:49 | |
| 41 | C8.2 | 2021/12/31 | 2918 | 19:32 | 19:46 | 20:02 | |
| 42 | C8.2 | 2021/08/29 | 2860 | 09:54 | 10:03 | 10:07 | |
| 43 | C8.1 | 2021/12/15 | 2907 | 10:31 | 10:44 | 10:48 | |
| 44 | C7.9 | 2021/10/26 | 2887 | 05:56 | 06:04 | 06:10 | |
| 45 | C7.6 | 2021/05/27 | 2824 | 22:54 | 23:15 | 23:24 | |
| 46 | C7.5 | 2021/12/24 | 2917 | 03:25 | 03:42 | 03:50 | |
| 47 | C7.5 | 2021/08/29 | 2860 | 00:34 | 00:44 | 00:50 | |
| 48 | C7.4 | 2021/08/27 | 2860 | 20:32 | 21:09 | 21:43 | |
| 49 | C7.2 | 2021/12/04 | 2898 | 23:21 | 23:59 | 00:14 | |
| 50 | C7.1 | 2021/12/28 | 2918 | 07:29 | 07:44 | 07:57 |
Latest news
Coronal hole faces Earth
M2.7 solar flare with earth-directed CME!
M4.4 solar flare from sunspot region 4168
Latest forum messages
Support SpaceWeatherLive.com!
A lot of people come to SpaceWeatherLive to follow the Solar activity or if there is a chance to see the aurora, but with more traffic comes higher costs to keep the servers online. If you like SpaceWeatherLive and want to support the project you can choose a subscription for an ad-free site or consider a donation. With your help we can keep SpaceWeatherLive online!
Latest alerts
Wednesday, 8 October 2025
06:45 UTC - Geomagnetic activity
Active geomagnetic conditions (Kp4) Threshold Reached: 05:32 UTC
Tuesday, 7 October 2025
22:00 UTC - Type II Radio Emission
Begin Time: 07/10/2025 20:07 UTC Estimated Velocity: 755km/sec.
15:00 UTC - Geomagnetic activity
Active geomagnetic conditions (Kp4) Threshold Reached: 13:43 UTC
07:48 UTC - Hemispheric Power Index
The OVATION model predicts the Hemispheric Power Index to reach 50GW at 08:46 UTC
Space weather facts
| Last X-flare | 2025/06/19 | X1.9 |
| Last M-flare | 2025/10/03 | M1.2 |
| Last geomagnetic storm | 2025/10/03 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| September 2025 | 129.8 -3.7 |
| October 2025 | 140.1 +10.3 |
| Last 30 days | 132.5 +1.1 |