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Fig. 5

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Radial velocity (vr) of ionospheric oxygen ions in (a) Run A1, (b) Run A2, (c) Run B1, (d) Run B2, (e) Run C1, and (f) Run C2 at an altitude of 450 km. The solid black curves in each panel are contour lines of the crustal magnetic fields with a magnitude of 40 nT at 400 km, and the vertical blue vector on the left indicates the direction of the solar wind motional electric field (ESW).

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