The primary science objectives for the Ionospheric Dynamics Instrument (IDI) investigation are related to the global response of the ITM to energy inputs from the magnetosphere and an understanding of the ways in which electric fields are internally generated by neutral atmosphere motions in the lower thermosphere and mesosphere. At low and mid latitudes the electric fields are generated by neutral atmosphere motions and temporal resolution on time scales of a second will adequately describe the global field and allow its relationship to neutral wind motion to be established. However, the redistribution of current systems and the electrodynamics associated with plasma structures requires temporal sampling rates at the highest possible frequencies. The results of these studies are presented graphically.
