Abstract
The analysis of solar wind He + + and H* ion distribution functions, collected over five months by the satellite Prognoz 1, shows that these are in general maxwellian but that often "tails" appear at higher speeds. The existing relation Vc~- Tc~, the observation of ratios of Te/Tp ~3.83 and Ve/Vp ~1.035 give evidence of preferential He + + ion heating and acceleration. The criteria for heating by dissipation of hydromagnetic waves proposed by Barnes and Hung (1973) are tested experimentally. Finally, multifluid models are likely to predict certain observations such as dependence of the velocity ratio Ve/Vp on the solar wind flux.
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