Observation of a supergranular cell and a vortex flow in one of its vertices. (a) Quiet-Sun region observed by the Hinode/NFI at disk center. The background image displays the mean Dopplergram obtained by averaging over the total duration of the data set, where red and blue regions correspond to downflow and upflow areas, respectively. The black superimposed arrows show the time-averaged horizontal velocity field retrieved with the LCT at the intensity maps. The black solid rectangle, with a FOV of 13.3 × 13.3 Mm2, marks the location of the vortex flow. (b) Close-up of the vortex flow. In this case, the black lines display the streamlines of the flows, and the arrows show their directions. Both Dopplergrams are saturated at ± 0.17 km s−1. (c) Mean unsigned flux density over the entire FOV. (d) Close-up of the white rectangle in panel c. White streamlines display the mean horizontal flow of the magnetogram, i.e., the horizontal proper motions of the NE element that is anchored in the vortex flow.
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