Abstract
The acceleration of the solar wind plasma near the Sun is governed by the critical (sonic point) structure of the appropriate fluid equations. For a multi-ion solar wind plasma with the components coupled by electric field and other interactions the generalized sonic points cannot be associated with any of the components alone. In this contribution the critical solution describing the passage of two-ion plasma from subsonic to supersonic region is obtained assuming sharply peaked ion temperature profiles, of interest in view of recent SOHO data. The topology of the generalized critical points follows as a by-product of the method.
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