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About: Alfvén surface     Goto   Sponge   NotDistinct   Permalink

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The Alfvén surface is the boundary separating the sun's corona from the solar wind defined as where the coronal plasma's Alfvén speed and the large-scale solar wind speed are equal. It is named after Hannes Alfvén, and is also called Alfvén critical surface or Alfvén point. Parker Solar Probe became the first spacecraft that crossed Alfvén surface of the Sun.