... Grant of RFBR #97-05-64085 . ... The project goal is the investigation of the global storm-time variations of electron density and temperature and dynamics of the topside ionosphere structure (day-side cusp, auroral oval, main ionospheric trough, ring ionospheric trough, subauroral Te peak and equatorial anomaly). ... The background Ne distribution at the height of ~430 km for the quiet night-time equinoctial conditions from the Cosmos-900 data is constructed and investigated - Fig.5. ...