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 193 Ångström wavelength

SDO/AIA 211

SDO/AIA 211 Ångström wavelength

Coronal hole detection map

Coronal hole detection map

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Space weather facts

Last X-flare2017/09/10X8.2
Last M-flare2020/05/29M1.1
Last geomagnetic storm2020/04/20Kp5 (G1)
Spotless days
Last 365 days308 days
2020148 days (77%)
Last spotless day2020/07/11

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Solar flares
12000X1.9
22012X1.4
32000M5.7
42000M1.9
52004M1.6
ApG
1200343G3
2200540G2
3200219G1
4201618
5200816
*since 1994

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