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<p>resistivity due to these collisions is small. In particular, the typical magnetic diffusion time over any length scale present in the system must be longer than any time scale of interest.<br/>
# The relevant length scales are much longer than the ion <a href="page.php?w=Plasma_parameters">skin depth</a> and the <a href="page.php?w=Larmor_radius">Larmor radius</a> perpendicular to the field, sufficiently long scales along the field to ignore <a href="page.php?w=Landau_damping">Landau damping</a>, and time scales much longer than the ion gyration</p><p>
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