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The paper gives the results of calculations of the equilibrium distribution of electron density in the F region of the ionosphere near the magnetic equator. The distributions are obtained as solutions of the continuity equation, including terms representing photoionization, loss, diffusion along geomagnetic field lines, and a small electromagnetic drift. It is found that the drift produces a significant effect and can give rise to results which conform more nearly to the observed distributions than do those obtained theoretically when drift is ignored.

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