An equatorial sheet current deduced from Pioneer 10 magnetic field observations has been added to a planetary dipole field to construct a model of magnetic field due to sources inside the magnetopause. This internal field has then been used ot claculate the magnetopause surface in a cyclic process to a fifth order, in cycles, at which the calculation converges. The resulting magnetopause is considerably flatter in shape than one resulting from a primarily dipole internal field source. The field internal and external to the magnetopause surface due to the currents on the surface has been computed by integrating over the entire magnetopause. A model for the total magnetospheric field of the inflated magnetosphere has been constructed by adding this latter contribution to the internal source fields to obtain a global model of an inflated Jovianlike magnetospheric field.