The atomic hydrogen density variation near the exobase has been inferred from measurements of both polarization and resonance-cell absorption of the hydrogen Lyman-alpha geocoronal emission, performed onboard the D2A satellite. Comparison of simultaneous measurements made in three different lines-of-sight, on April 27, 1971, have shown firstly, a steep North pole depletion at 0600 L.T., with a density ratio of a factor of 2.4 between midlatitude and North pole densities, and secondly, a non-sinusoidal diurnal variation with two steep, local density depletions occurring around 0400 L.T. (+40¿ latitude), and around 1600 L.T. (-20¿). These observations, compared to earlier measurements of hydrogen density and correlated parameters, suggest that the non-thermal loss processes are dominant in determining the density distribution, and subject to large and local perturbations. ¿ 1977 American Geophysical Union