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<p>to "subsonic", where <a href="page.php?w=Speed_of_sound">the speed of sound</a> c<sub>s</sub> is defined by</p>

<p>where  is the <a href="page.php?w=Heat_capacity_ratio">ratio of specific heats</a>,  is the <a href="page.php?w=pressure">pressure</a>, and  is the density of the plasma.</p>

<p>A common complication in astrophysics is the presence of a magnetic field. For instance, the charged particles making up the solar wind follow spiral paths along magnetic field lines. The velocity of each particle as it gyrates around a field line can be</p><p>
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