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These holes are created by large regions of the solar magnetic field that have a single polarity (unipolar) and extend far out into the solar system. These are sometimes called 'open' magnetic field lines since they don't connect back to the Sun. The regions appear dark because they have a lower density of the hot coronal plasma. The open magnetic field lines make it easy for the charged plasma to stream away from the Sun, forming the fast component (about 700 kilometers per second) of the solar wind.
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