Abstract
Calculations of the equilibrium electron density distribution in the F2 region of the equatorial ionosphere are described. The effects of photoionization, loss, diffusion along geomagnetic field lines, and an electromagnetic drift of arbitrary magnitude are included. The work is an extension of previous calculations in which the drift was included as a perturbation effect only. It is found that under representative daytime ionospheric conditions an upward drift of a few metres per second is sufficient to produce an equatorial anomaly which is quantitatively similar to that observed experimentally.
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