A PARAMETER STUDY OF THE 2-FLUID SOLAR-WIND

A two-fluid model of the solar wind was introduced by Sturrock & Hartle (1966) and Hartle & Sturrock (1968). In these studies the proton energy equation was integrated neglecting the heat conductive term. Later several authors solved the equations for the two-fluid solar wind model keeping the proton heat conductive term. Methods where the equations are integrated simultaneously outward and inward from the critical point were used (e.g., Durney 1973; Couturier 1977; Cuperman, Detman, & Dryer 1988). The equations were also integrated inward from a large heliocentric distance (e.g., Nerney & Barnes 1977). These methods have been applied to cases with low coronal base electron densities and high base temperatures. In this paper we present a method of integrating the two-fluid solar wind equations using an iteration procedure where the equations are integrated separately and the proton flux is kept constant during the integrations. The technique is applicable for a wide range of coronal base densities and temperatures. The method is used to carry out a parameter study of the two-fluid solar wind.