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Fig. 3

image

Top panel: a histogram of the wavelength Δλ positions of the NLTE Stokes V amplitude of the Si i 10 827 Å line. Arrows and numbers indicate the mean wavelength position of this amplitude in the left and right wings of the line. Bottom panel: histograms of the NLTE heights of formation HΔλ(NLTE) calculated for three wavelengths within the Si i 10 827 Å line intensity profile. The mean heights of formation H are shown near each of the histograms. Values of HΔλ(NLTE) represent the heights, where the NLTE optical depth at a given line wavelength Δλ is equal to unity: τΔλ(NLTE) = 1. The histograms have been calculated using the 3D snapshot with ⟨ | BZ | ⟩ = 80 G and the simplest Si i model with six bb transitions (see the left bottom panel of Fig. 4). The top horizontal axis gives the mean optical depths log 10τ5 corresponding to the heights shown in the bottom horizontal axis. The scaling factor SH = 0.1.

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