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
Sunday, 1 February 2026
Complex sunspot region 4366
Monday, 19 January 2026
CME impact! S4 solar radiation storm
Sunday, 18 January 2026
X1.9 solar flare with earth-directed CME
Latest forum messages
Yes, we really went to the moon before. 2AR4366 1026Filaments and prominences 487Do the high-resolution sunspot counts point to more complex sunspots? 62AR 4373 4
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|---|---|
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| Monthly mean Sunspot Number | |
|---|---|
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