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L'effet de la diffusion thermique sur la distribution de l'hélium dans l'hétérosphère
The effect of thermal diffusion on the vertical distribution of helium in the heterosphere is discussed. It is shown that an increase in the helium concentration of 1 .4 to 2.4 at the thermopause level, due to thermal diffusion, leads to atmospheric densities explaining the observed drag of the satellite Echo 1.
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