Abstract
The topology of the magnetosphere in the presence of a large, time independent ring current, which is symmetrical with respect to the axis of the Earth's dipole field and, in a certain region of the equatorial plane, reverses the direction of the dipole field, is investigated. Two model ring currents are considered. In one case the ring current is centred at 3 and in the other at 7 Earth radii from the centre of the Earth. It is shown that when the intensity of the ring current is large enough, the total field has two neutral points in the equatorial line of a meridianal cross-section; the neutral points comprise an X-type point and an O-type point with the X-type point nearer the Earth.
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