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The magnetosphere-ionosphere coupled convection is affected by the magnetic field configuration which is derived from the null-separator structure. In the present talk, we will investigate the interaction in detail from the numerical results of the global MHD simulation.<p>The main findings of this research are as follows;<ol><li>The null-separator structure in the vacuum field forms a torus and two cylinders [Lau and Finn, 1990]. In the solar wind environment, as the two cylinders bend toward the magnetic equatorial plane on the night side, the anti-parallel magnetic field lines appear in the equatorial plane. However, these anti-parallel field lines can not merge because there is no null point in the equatorial plane of the tail magnetosphere. Therefore, the closed field lines must occupy the region between the two cylinders. This is the formation of the plasma sheet.</li><li>The cylinder accompanies the open slot from the tail magnetosphere to the solar wind in the magnetotail. Plasmas and electromagnetic energy of the solar wind can intrude the tail magnetosphere through the slot. Furthermore, the plasmas entering through the slot create a plasma bulge in the magnetotail.</li><li>In the northern hemisphere of the negative IMFBy condition, the Poynting flux passing the dayside magnetopause in the morning / afternoon side of the separator line enters the inner magnetosphere / escapes from the magnetosphere through the magnetotail. This behavior is associated with the magnetic field configuration of the null-separator structure.</li></ol><p> Lau, Y.-T. and Finn, J. M. (1990), <em>Astrophysical Journal</em>, <strong>350</strong>, 672-691.
