The rotation angle and fractional linear polarisation as a function of the solar outflow for an isotropic velocity-distribution function of the O5+ ions (solid lines), for anisotropic velocity-distribution functions (w⊥/w∥ = 2, dotted lines), (w⊥/w∥ = 1/2, broken lines). The perpendicular and parallel velocity-distribution functions are proportional to the local thermal velocity of the O5+ ions, i.e., .
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