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A study of the formation and movement ofsequential Sporadic-E layers observed during the night-time hours at two Indianlow-latitude stations, SHAR (dip 10°N) and Waltair (dip 20°N) shows that thelayer are formed around 19:00 h. IST at altitudes of ~180 km. They descend tothe normal E-region altitude of about 100 km in three to four hours and becomesblanketing type of Es before they disappear. However, the absence of thesedescending layers at an equatorial station, Trivandrum (dip 2°N) gives theexperimental evidence for wind shear theory. The meridional neutral wind derivedfrom the height variation of the F-layer showed significant poleward wind duringthe descent of these layers. Hence it is inferred that these layers are formedas a consequence of the convergence of plasma by the poleward wind and theequatorward propagating gravity waves (inferred from the height fluctuations ofF-layer).  <b>Key words. </b>Ionosphere (active experiments; equatorialionosphere · ionospheric irregularities

Sequential sporadic-E layers at low latitudes in the Indian sector