Abstract

Two- and three-dimensional resistive MHD simulations in cylindrical geometry are employed in order to study modifications of the electrodynamical interaction between Jupiter and Io due to mass loading effects. The main topic is the question if some observational features which cannot be explained by present theories may be caused by Io's intense plasma production or ionization of torus plasma. It can be shown how injection of cold plasma causes a corotation lag of the torus in which consequence a field-aligned current system is built up. If this current becomes supercritical an anomalous resistivity allows the formation of acceleration zones, which may explain the occurrence of Io-independent decametric radiation. Moreover, mass loading leads to a significant enhancement of both the magnetic and the gas pressure in Io's wake where an additional current system is generated.

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