Data on ion and electron temperatures and concentrations to several thousand kilometers of altitude were obtained from the Atmosphere Explorer C satellite for 1974 and to 850 km from Arecibo incoherent scattr radar measurements. These data were used to normalize diffusive equilibrium profiles. From these profiles and by using the neutral atmospheric model of Jacchia [1971> and a new hydrogen model, the charge-exchange-induced neutral hydrogen escape fluxes for equatorial and middle latitudes were calculated. The escape flux was found to range from abouet 5¿107 to 6¿108 atoms cm-2 s-1, depending upon position and time, where the 500-km altitude surface was the reference level for the fluxes. This confirms earlier estimates that the charge exchange loss is more important than Jeans escape for the earth.

It is also found that inside the plasmapause this charge exchange process with hot plasmapheric ions is the major production and loss process for te sathellite population in the hydrogen geocorona.