Analysis of Conductance Effects on Inner Magnetospheric Electric Fields M.W. Liemohn (University of Michigan Ann Arbor, MI 48109), A.J. Ridley, J.U. Kozyra, D.L. Gallagher, D.M. Ober Modeling results of the inner magnetosphere showing the influence of the ionospheric conductance on the inner magnetospheric electric fields during the April 17, 2002 magnetic storm are presented. Using a kinetic plasma transport code that highly resolves the velocity space distribution, results from several simulations with different input and boundary conditions are examined. These results are analyzed in combination with observations of the inner magnetospheric plasma populations, in particular the plasmapause location as seen by IMAGE EUV. The electric field description, and in particular the ionospheric conductance, is the only variable between the simulations. Results from the data-model comparisons are discussed in detail, including a presentation of accuracy versus electric field model sophistication. ___________ Presentation at the Yosemite Conference of Inner Magnetospheric Interactions, 3 - 6 February 2004, Yosemite, California, USA