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Fig. 4.


Slices through the horizontal divergence (top row), vx (bottom left), and vy (bottom right) at t = −13.6 h for the AR. The red solid lines show the average values for the AR, and the red dashed lines show the associated 1σ error in the mean. The gray shaded regions show the 1σ error estimates from the quiet-Sun control regions. Left column: slices are taken at y = 0. Right column: slices are taken at x = −28 Mm. In all cases the divergence or flow component has been averaged over ±11.1 Mm (8 grid points) in the transverse direction. The averaging regions for the cuts are shown in the bottom left panel of Fig. 2.

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