Conditions at the base of the corona of Chen et al. (2014, 2015). Vertical current density Jz (panel a), vertical magnetic field Bz (panel b) and the vertical component of the double curl of the electromotive force [∇ × ∇ × (u × B)] z (panel c) in a horizontal plane at a height of z = 2.9 Mm placed around the field lines (white dots); we refer to Sect. 3.2.
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