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Observations of daytime E region echoes extending to altitudes as low as87 km made using the Gadanki MST radar are presented. The echoing regionsdisplay descending layer resembling the characteristics of tidal winds andshow structures with periods 2–4 min having both positive and negativeslopes. At the center of the layer where strongest SNR is observed, thevelocity is maximum and spectral width is minimum. At altitudes slightlyabove and below, where SNR is relatively low, velocity is low but spectralwidth is maximum. Daytime observations of echoes extending to such a lowaltitude and associated structures akin to nighttime quasi-periodic echoesthroughout the observational period are the most significant results, notreported earlier from Gadanki and other locations. Other notable results arelarge SNR (as high as 15 dB) and spectral width (as high as 70 m/s) at thebottommost altitudes, where collisional damping of the plasma waves issignifican

Gadanki radar observations of daytime E region echoes and structures extending down to 87 km