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(a) Variations in the quiet-time equatorial zonal drifts (positive eastward) at 200 km produced by EZDrifts as a function of local time, longitude, and season (Dec. 21, Mar. 21, and Jun. 21). (b) Same as (a) but for 400 km altitude. Computations for low solar flux conditions (F10.7 = 73.7 SFU).
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