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Upper panel: Local Alfvén speed, vA (plus symbols), inferred from the Mach numbers in Figure 10. Dashed and dash-dotted lines refer to vA that are modeled with the empirical electron density models of Leblanc et al. (1998) and Saito et al. (1977), respectively, together with the empirical magnetic field function of B = 2.2(r/R⊙)−1. Lower panel: Magnetic field strength B inferred from vA in the upper panel together with the determined ρu. Lines in dashed and dash-dotted are radial magnetic field profiles given in Mann et al. (1999) above the quiet Sun and Dulk and McLean (1978) above an active region, respectively.
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