Fig. 1.
Panel a: magnetogram at height where ⟨τ⟩=1, used as the boundary input. The “hgcr_hslice.pro” from the data link is used to derive the MHD quantities sampled at constant height. For photosphere where ⟨τ⟩ = 1, set input parameter k = 116. Panel b: magnetic field line patterns in the box outlined in panel a. Purple/green lines represent open/closed field lines.
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