Measurements have been made by the low energy electron experiment (LEE) on the Atmosphere Explorer-C satellite (AE-C) of electrons and protons in the energy range 0.2 to 26 keV. We analyze data taken in the altitude range 250 to 300 km during the period 15 December 1973 to 25 May 1975. Measurements were made over a range of magnetic latitudes extending from the equator to 80¿. The average electron flux at midlatitudes at night (19 to 05 local solar time) is found to be ~ (1--5) ¿10-4 ergs cm-2 sec-1, and increases by about an order of magnitude during the day. The upper limit for the nighttime and daytime proton energy flux is about 1¿10-4 ergs cm-2 sec-1. The total nighttime energy flux will result in a production rate of ~.3 to ~10 ions cm-3 sec-1 at the base of the F region and in the D region respectively and should constitute an important source of ionization in the nocturnal ionosphere. The average daytime (05--09 LT) total energy flux is insignificant in comparison with other sources of energy in the thermosphere. The average mid-auroral zone nocturnal electron energy flux is ~2 ergs cm-2 sec-1, and appears to decrease during the day (average ~1.5 ergs cm-2 sec-1). The average for protons is 0.04 ergs cm-2 sec-1 for both day and night.