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(a) Variations in the quiet-time, LSF equatorial zonal drifts (positive eastward) measured by C/NOFS as a function of local time, longitude, and season. Reproduced from Fejer et al. (2013). Note that the color bar varies from −90 m/s to 110 m/s. (b) Variations in the quiet-time, LSF equatorial zonal drifts (positive eastward) at C/NOFS average height (650 km) produced by EZDrifts as a function of local time, longitude and season (Dec. 21, Mar. 21, and Jun. 21).
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