Abstract

Bulk flow of plasma in the outer magnetosphere has been studied using measurements of protons (30 eV 18 R E at that time. As the satellites pass from the magnetotail to the magnetosheath, they traverse a region, the boundary layer, whose thickness ranges up to a few thousand kilometers. The boundary layer plasma has a temperature similar to that of the magnetosheath plasma, but its number density and bulk flow speed are substantially less than those of the magnetosheath plasma. It is suggested that the boundary layer is the magnetic projection of the day-side cusp and is a site of energy and plasma transfer from the magnetosheath into the plasma sheet.

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