Numerical solutions of the continuity equation for electrons are obtained for the purpose of testing the vertical-drift effect on the plasma distributions in the equatorial F region of the earth's ionosphere. The results have shown that the altitude profile of electron density and the accompanied vertical-drift velocity measured at Jicamarca are consistent and confirmed that electromagnetic lifting is the major factor to cause the equatorial anomaly as suggested by Martyn . The calculated values are found to be in good agreement with the observations both in magnitudes and in distribution patterns.
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