THE LYMAN-ALPHA LINE FROM THE SOLAR-WIND ACCELERATION REGION - RESULTS FROM AN 8-MOMENT APPROXIMATION 2-FLUID SOLAR-WIND MODEL

We investigate neutral hydrogen in an eight-moment, two-fluid, high sp eed solar wind model. In this model the proton heat flux decreases rap idly in the solar wind acceleration region, and extended coronal heati ng of the proton gas leads to high coronal proton temperatures and lar ge solar wind flow speeds. The properties of the Lyman-alpha line from the neutral hydrogen in two such models are studied. We show that the temperature maximum in the corona inferred from the observed Lyman-al pha line may be more than 20% lower than the proton temperature maximu m.