Abstract
The primary cosmic alpha -particle energy spectrum is investigated, using photographic emulsions exposed on July 3Oth, 1957. The total flux observed is (151 plus or minus 9) particles/cm/sup 2/. sr. sec. The differential energy spectrum shows a broad maximum between 400 and 600 Mev/nucleon, and appears different in shape from the spectrum observed at solar minimum. No particles are observed to have kinetic energies below 200 Mev/nucleon, but a substantial flux is observed between 200 and 300 Mev/nucleon. From the centered dipole approximation to the geomagnetic field, a cut-off energy is expected at this latitude of 292 Mev/nucleon. The results are in disagreement with this figure. (auth)
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