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Fig. 9


a) 2D electron density map from 2011 September 22. b) The magnetic field strength obtained with PFSS extrapolation, and c) the Alfvén speed map obtained from the electron density and magnetic field strength values (Eq. (10)). The active region (AR), quiet Sun (QS), and coronal hole (CH) radial profiles used in Fig. 10 are also shown.

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