Electric field and conductivity measurements were made in the altitude range from 10 to 27 km during the Electrodynamics of the Middle Atmosphere superpressure balloon experiment in 1983 and 1984. These balloons primarily floated at a constant altitude of 26 km, but due to the eventual loss of superpressure near the end of each flight, daily altutide variations at sunset and sunrise occurred. This paper presents electric field, conductivity and derived current density data from the two EMA flights which underwent the longest periods of this daily altitude variation. This includes data from 18 days in late 1983 and early 1984 when the balloons were between longitudes of 50¿ and 100 ¿E and between magnetic L values of 4.3 and 9.5 in the southern hemisphere. The average conductivity for all the data is well represented by the fit to the EMA6 flight where ⟨&sgr;(z)⟩=(1.8¿0.2)¿10-13 exp(z/7.5) S/m and z is the altitude in kilometers. The vertical field is also shown to be well fit in this altitude range by a similar single term exponential with a scale height of the opposite sign but similar magnitude. No convincing evidence for variation of the current density with altitude was found. While the average scale height was about 7.5 km, it is also shown that data from individual days are also well fit by an exponential, but with values which can be significantly different (up to +8.9 km in one case). The paper also presents evidence for a small (25% maximum) perturbation in the conductivity caused by the balloon wake. The paper concludes with a comparison of these data to other measurements and to various models of the stratospheric conductivity. It is found that the EMA conductivity measurements are quite similar to other previous measurements, yet significantly different from some model predictions. ¿ American Geophysical Union 1991