We present a comparison of particle radial diffusion in the earth's magnetosphere that is determined from measurements of fluctuating magnetic and electric fields. We show, for a day when simultaneous satellite and ground-based magnetic field data and published electric field data are available, that estimates of the radial diffusion from these fluctuating fields are comparable. We also show that the fluctuating fields at high latitudes, in the auroral zone, produce radial diffusion coefficients a factor of ten larger than would be expected by the extrapolation of subauroral latitude observations to higher latitudes.