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
Monday, 23 December 2024
M9.0 solar flare with earth-directed CME
Sunday, 8 December 2024
X2.2 solar flare, SDO outage
Thursday, 21 November 2024
Major far side eruption, S1 radiation storm
Latest forum messages
Changelog/Featurelog 163AR 13932 592024/12/23 CME by AR 13932's M8.9 flare. 6Incoming & Unnumbered Active Regions 1366Growth of Cycle 25 779
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Space weather facts
| Last X-flare | 2024/12/08 | X2.2 |
| Last M-flare | 2024/12/24 | M4.1 |
| Last geomagnetic storm | 2024/12/17 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| November 2024 | 152.5 -13.9 |
| December 2024 | 110.7 -41.8 |
| Last 30 days | 117.3 -41.4 |