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.

A northern hemisphere coronal hole was detected in an earth-facing position on Monday, 18 November 2019

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-flare:2017/09/10X8.2
Last M-flare:2017/10/20M1.0
Last geomagnetic storm:2019/10/26Kp5 (G1)
Number of spotless days in 2019:245
Current stretch spotless days:18

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ApG
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*since 1994

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