Coronal holes Help
On this page you will find all the information you need to spot any coronal holes on the earth-facing solar disk. Coronal holes are the source of fast solar wind streams which sometimes have the potential to produce minor to moderate geomagnetic storms. If our automated detection system recently detected an earth-facing coronal hole it will also be mentioned on this page.
SDO/AIA 193
SDO/AIA 211
Coronal hole detection map
Latest news
Wednesday, 9 October 2024
X1.8 solar flare, severe geomagnetic storm watch
Tuesday, 8 October 2024
Double X-flares, glancing blow possible
Saturday, 5 October 2024
Incoming CME, G3 geomagnetic storm watch
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Space weather facts
| Last X-flare | 2024/10/09 | X1.4 |
| Last M-flare | 2024/10/09 | M7.6 |
| Last geomagnetic storm | 2024/10/08 | Kp7+ (G3) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| September 2024 | 141.4 -74.1 |
| October 2024 | 175 +33.6 |
| Last 30 days | 148.9 -28.3 |