a) Electron density at a function of height for an active region (PA = 75°) the quiet Sun (PA = 270°) and coronal hole (PA = 165°). b) Magnetic field strength is shown for the same position angles. c) Calculated Alfvén speed for the three profiles. Active region (AR), coronal hole (CH), and quiet Sun (QS) profiles are displayed in Fig. 9.
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