Cosmic-Ray Heavy Nuclei at the Geomagnetic Equator

Abstract
The flux of primary cosmic-ray heavy nuclei has been measured with a sandwich of C2 and G5 emulsions near the island of Guam, magnetic latitude 4°N. The emulsions were exposed at about 101 000 ft for 7.3 hours and the calculated fluxes at the top of the atmoshpere in particles/m2-sec-sr were found to be: