Abstract
The motion of a system of coaxial cylindrical plasma sheets, initially projected towards an axial magnetic field is investigated and applied to the interaction of the solar stream with the geomagnetic field. It is found that the sheets may or may not overtake each other according to the initial conditions assumed. In either case a disordered region is formed behind the front sheet which is analogous to the turbulent transition region between the magnetospheric boundary and the detached bow shock wave. The currents induced in this turbulent region shield the outer sheets from the axial magnetic field. A further conclusion is that the density of the stream near the boundary is only increased by a factor of three or four due to the compression of the magnetic field.
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