From: "Jones Beene"
In the late 1990s the UV instrument on board SOHO observed the solar wind
emanating from the poles of the Sun, and found that the wind accelerates
much faster than can be accounted for by normal physics (thermodynamic
expansion) alone.
in addition to adiabatic expansion the magnetic field lines affect the solar
wind -- as you near the poles the field lines are open -- the field lines
are closed as you approach the ecliptic -- the ecliptic solar wind oft
times is not supersonic and quite variable
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-alex
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