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The electrodynamics of the pre-sunrise equatorial F-region isinvestigated using HF Doppler radar and digital ionosonde. Theobservations are limited to those days for which the radar probingfrequency is below the <I>fo</I>F2 value. The ionosphere observation usingHF Doppler radar exhibit interesting features during pre-sunriseperiod similar to the post sunset pre-reversal enhancement. The moststriking feature observed during pre-sunrise period is the suddendownward excursion in the vertical drift around local sunrisefollowed by an upward turning. Pre-sunrise observations of verticalplasma drift and the sunrise downward excursion followed by anupward turning after the ground sunrise related to the zonalelectric field at the equatorial F-region are the most significantresults not reported earlier

Electrodynamics of the equatorial F-region ionosphere during pre-sunrise period