The general characteristics of ionospheric winds during twilight have been determined from observations of the motion and growth of sunlit trails of alkali vapor. Typical large shears and small features are described. Specific wind profiles are compared with nearly simultaneous measurements of electron concentration from rocket‐borne probes. Generally, the narrow regions of enhanced electron concentration measured by the probes do not occur in the low velocity region of an E‐W shear. However, the ionization peaks appear to be associated with certain other features of the wind profile.
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Bedinger et al. (1966) studied this question.
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