Abstract
Incoherent scatter measurements of ion drift velocities obtained by the quadristatic incoherent scatter sounder of Saint-Santin have been used to analyse midlatitude electrodynamic during the GTMS period of June 1984. June, 26, 1984 (first day of this period) is used as a magnetically quiet reference day in this study. The following results are obtained : 1) On June 27, the electric field and neutral wind disturbances could be interpreted by the sole action of the ionospheric disturbance dynamo process, 2) On June 28, two physical processes are invoked to interpret the observations : the ionospheric disturbance dynamo and the direct penetration of magnetospheric convection electric fields.
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