Fig. 9.
Maps of the geometrical height at which different τc levels are reached in NOAA AR 10923: τc = 1 (top left), τc = 10−1 (top right), τc = 10−2 (bottom left), and τc = 10−3 (bottom right). All values are given with respect to the geometrical height for that τc level in the quiet Sun, zqs(τc). The quiet-Sun value is calculated as the spatial average over the white rectangle.
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