Abstract
Abstract : On field lines that are closed, oppositely directed plasma flows analogous to the polar wind can originate from conjugate regions of the ionosphere and encounter each other near the equatorial plane. For a background plasma of sufficiently low equatorial density (N sub 0 or = 20/cc) thermalization occurs via Coulomb collision. These flows, together with the complementary thermalization mechanisms, constitute a rapid means of replenishing the plasmasphere (d(N sub O)/dt about 10/cc-hr) during the recovery phase of a magnetic storm. Beyond the quiet-day plasmapause location, the conditions for two-stream instability appear to be present continuously, since the counter-streaming plasmas are simultaneously convected to the magnetospheric boundary. (Author)
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