| Summary: | The intensity of primary cosmic-ray electrons has been measured from 1960 through 1966 at balloon altitude over Ft. Churchill, Manitoba. Initial measurements were made with an energy-loss vs. range counter telescope from 1960 through 1964. From 1964 through 1966 an energy-loss vs. total energy counter telescope was used. Overlapping data exist for both instruments in 1964. Our results are consistent with the absence of a solar modulation effect for electrons in the 0.25 to 1.05 BV rigidity range. The experimental errors lead to an upper limit of 60% for the possible fractional change of the electron intensity over this period. © 1968 Canadian Science Publishing. Presented at the Tenth International Conference on Cosmic Rays, held in Calgary, June 19-30, 1967, MOD-43. Work supported by the National Aeronautics and Space Administration under grants No. NsG-144-61 and NsG-426 (R.V.), the National Science Foundation under grant No. GP-4709, and the U.S. Air Force Office of Scientific Research under contract AF 49 (638)-1008. We gratefully acknowledge the help given to us by R. Chipman and P. McIntyre in the analysis of the data.
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