| Number of sunspots |
Size | Class Magn. | Class Spot | Location | |
|---|---|---|---|---|---|
| 1998/04/10 | 9 | 40 | CRO | S21E06 | |
| 1998/04/11 | 10 | 180 | DSI | S22W07 | |
| 1998/04/12 | 8 | 120 | DSO | S22W21 | |
| 1998/04/13 | 6 | 100 | CSO | S21W34 | |
| 1998/04/14 | 7 | 90 | CSO | S22W46 | |
| 1998/04/15 | 2 | 40 | CSO | S23W61 | |
| 1998/04/16 | 3 | 40 | CSO | S21W71 |
| C |
|---|
| 2 |
| Start | Maximum | End | ||||
|---|---|---|---|---|---|---|
| 1 | C1.74 | 1998/04/09 | 19:35 | 19:42 | 19:48 | |
| 2 | C1.61 | 1998/04/15 | 21:40 | 21:49 | 22:10 |
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| Last X-flare | 2026/03/30 | X1.5 |
| Last M-flare | 2026/04/09 | M1.0 |
| Last geomagnetic storm | 2026/04/03 | Kp7- (G3) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (3%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2026 | 85.9 +7.7 |
| April 2026 | 107.7 +21.8 |
| Last 30 days | 100 +44.8 |