What is the functional difference between magnetic field lines causing fast wind versus slow wind?

Answer

Fast wind originates where field lines open directly into space; slow wind originates where lines loop back or are complex

The fast wind originates where magnetic field lines open directly into space, providing an unimpeded path, whereas the slower wind comes from regions where field lines loop back toward the Sun or are magnetically complex.

What is the functional difference between magnetic field lines causing fast wind versus slow wind?
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