In the middle atmosphere above 60 km the electron concentration increases with altitude reaching values of 1010 m-3 in the daytime ionospheric E regions near 100 km. The electrons are more mobile than the ions and diffuse more rapidly through the neutral atmosphere. The electron diffusion polarizes the medium, causing an electric field to develop that acts to retard the electron diffusion and enhance the conduction current of ions. We use a global zonally numerical model of atmospheric electricity from the ground to 100 km to examine the effect of ambipolar diffusion and the earth's geomagnetic field on the currents and fields in the middle atmosphere. The results shown that above about 65 km, ambupolar diffusion generates local electric fields and conduction currents that balance diffusion currents. The electric fields and conduction currents are a few orders of magnitude larger than the vertical fields and currents calculated from the downward mapping of the ionsophere potential without taking electric duffision into account. Ambipolar diffusion does not alter the total current flowing in the global circuit. It is a local effect where enhanced conduction currents flows to balance the electron diffusion current.