Results of a coordinated auroral experiment involving the Atmosphere Explorer C satellite and a sounding rocket are reported. Auroral primary electron fluxes and neutral gas densities measured by instruments on the satellite are used in a model calculation of the thermospheric manifestation of the aurora. There is encouraging agreement between the calculated and measured electron density, electron temperature, secondary electron flux, and O I emissions at 5577 and 6300 ¿. A discrepancy between the calculated and the rocket-measured 3914-¿ emission profile is discussed in terms of experiment geometry and auroral physics. The coordinated measurements are used in infer vertical fluxes of ionization and of electron thermal energy at high altitudes.