| Sunspot number | New regions | Background flux | C | M | X |
|---|---|---|---|---|---|
| 76 | 0 | C3.2 | 3 | 1 | 2 |
| Region | Start | Maximum | End | |
|---|---|---|---|---|
| 0488 | X2.7 Play | 01:09 | 01:30 | 01:45 |
| 0488 | X3.9 Play | 09:43 | 09:55 | 10:19 |
| 0486 | M3.9 | 15:26 | 15:32 | 15:43 |
| - | C4.4 | 19:51 | 19:54 | 19:57 |
| - | C5.4 | 20:31 | 20:37 | 20:41 |
| - | C3.1 | 22:28 | 22:36 | 22:40 |
| Auroral activity | Minor | Severe |
|---|---|---|
| High latitude | 30% | 40% |
| Middle latitude | 10% | 1% |
| Predicted Kp max | 4 |
| Solar activity | |
|---|---|
| M-class solar flare | 1% |
| X-class solar flare | 1% |
| B1.2 B1.7 B1.4 B1.5 B3.2 B5.4 B8.4 | |
| Moon phase |
|---|
| New Moon |
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| Last X-flare: | 2017/09/10 | X8.2 |
| Last M-flare: | 2017/09/09 | M1.1 |
| Last geomagnetic storm: | 2017/09/18 | Kp5 (G1) |
| Number of spotless days in 2017: | 56 | |
| Last spotless day: | 2017/08/01 | |
