“…The multi-component plasmas containing cold and hot electrons and ions, formed by the mixing of two plasmas of different temperatures could exist on a time scale shorter than the thermalization time, which in the collisionless space plasmas could be very large, of the order of several hours to days in the magnetosphere. Several spacecrafts have indeed observed multispecies plasmas in the magnetosphere (Tokar and Gary, 1984;Lin et al, 1984;Koskinen et al, 1990;Onsager et al, 1993;Matsumoto et al, GRL, 1994;Pottelette et al, 1999;Vogiatzis et al, 2006;Teste et al, 2007;Backrud-Ivgren et al, 2005;Pickett et al, 2005).…”