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Observations carried out over several diurnal cycles using the Indian MST Radar located at Gadanki (13.5 o N,79.2 o E) show layered structures of enhanced echo intensity at Zenith as well as oblique (Zenith angle χ=10 o ) beams. These structures are observed to last for more than 4h and often last as long as 18h. Simultaneous MST radar observations and radiosonde data from...