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We examine the global energetics the solar wind magnetosphere ionosphere system by using the global MHD simulation code GUMICS-4. We show simulation results for a major magnetospheric storm (April 6, 2000) and a moderate substorm (August 15, 2001). The ionospheric dissipation is investigated by determining the Joule heating and precipitation powers in the simulation during the two events. The ionospheric dissipation is concentrated largely on the dayside cusp region during the main phase of thedoi:10.5194/angeo-22-549-2004 fatcat:m4zmycp2qfc73cfoeqayjjram4