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Qu'est-ce (qui) est full of holes - définition
![When observed in [[extreme ultraviolet]], coronal holes appear as relatively dark patches in the Sun's corona. Here, there is a large coronal hole in the northern hemisphere.](https://commons.wikimedia.org/wiki/Special:FilePath/Coronal Hole Front and Center.jpg?width=200 "When observed in [[extreme ultraviolet]], coronal holes appear as relatively dark patches in the Sun's corona. Here, there is a large coronal hole in the northern hemisphere.")
![A coronal hole at the Sun's north pole observed in [[soft X-ray]]](https://commons.wikimedia.org/wiki/Special:FilePath/Sun in X-Ray.png?width=200 "A coronal hole at the Sun's north pole observed in [[soft X-ray]]")
Wikipédia
A coronal hole is a temporary region of relatively cool, less dense plasma in the solar corona where the Sun's magnetic field extends into interplanetary space as an open field. Compared to the corona's usual closed magnetic field that arches between regions of opposite magnetic polarity, the open magnetic field of a coronal hole allows solar wind to escape into space at a much quicker rate. This results in decreased temperature and density of the plasma at the site of a coronal hole, as well as an increased speed in the average solar wind measured in interplanetary space. If streams of high-speed solar wind from coronal holes encounter the Earth, they can cause major displays of aurorae. Near solar minimum, when activity such as coronal mass ejections is less frequent, such streams are the main cause of geomagnetic storms and associated aurorae.
