Sunspot region AR8517
| Number of sunspots |
Size | Class Magn. | Class Spot | Location | |
|---|---|---|---|---|---|
| 1999/04/17 | 4 | 20 | BXO | N20W21 | |
| 1999/04/18 | 3 | 30 | CSO | N22W36 | |
| 1999/04/19 | 6 | 30 | CRO | N22W51 | |
| 1999/04/20 | 5 | 70 | DSO | N22W63 | |
| 1999/04/21 | 3 | 100 | DSO | N22W77 | |
| 1999/04/22 | 1 | 40 | HSX | N24W88 |
| B | C |
|---|---|
| 3 | 1 |
The top 4 solar flares from sunspot region 8517
| Start | Maximum | End | ||||
|---|---|---|---|---|---|---|
| 1 | C1.1 | 1999/04/18 | 21:12 | 21:19 | 21:23 | |
| 2 | B8.36 | 1999/04/21 | 00:19 | 00:22 | 00:27 | |
| 3 | B6.76 | 1999/04/21 | 16:46 | 16:50 | 16:52 | |
| 4 | B5.23 | 1999/04/21 | 06:02 | 06:05 | 06:07 |
Latest news
Wednesday, 14 May 2025
Another X-flare! Potent sunspot region 4087!
Tuesday, 13 May 2025
X1.1 solar flare from sunspot region 4086
Tuesday, 15 April 2025
CME arrival, G3 storm watch
Latest forum messages
Filaments and prominences 166AR4087 112Unspecified geomagnetic activity 2427Incoming & Unnumbered Active Regions 1883AR4086 49
More topicsSupport SpaceWeatherLive.com!
A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!
Space weather facts
| Last X-flare | 2025/05/14 | X2.7 |
| Last M-flare | 2025/05/14 | M4.6 |
| Last geomagnetic storm | 2025/05/03 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| April 2025 | 140.6 +6.4 |
| May 2025 | 74.9 -65.7 |
| Last 30 days | 101.3 -25.6 |