Abstract
Three-dimensional current systems are constructed semi-quantitatively for different epochs of several polar magnetic substorms, mainly on the basis of the distribution of their magnetic fields on the earth's surface. In a representative case the current system consists of an asymmetric ring current belt in the day-evening sector, current along the field lines from the morning end of the ring current to the northern and southern ionospheres, ionospheric current along the auroral oval in the dark sector (the auroral electrojet), and current along the field lines from the western end of the auroral electrojet to the ring current. The distribution of asymmetric ring current particles thus deduced in a previous paper (Akasofu and Meng, 1969) and in this work is remarkably similar to that observed by Frank (1968).
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