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High-Altitude Intensities of the Medium and Heavy Cosmic-Ray Nuclei and of the Star-Producing Component over a 25-Hour Interval
Phys. Rev. 108, 1327 – Published 1 December, 1957
DOI: https://doi.org/10.1103/PhysRev.108.1327
Abstract
Results are reported on a study of the hourly averaged values of intensity of medium and heavy cosmic-ray nuclei and of the star-producing component over a day and night interval, at an average atmospheric depth of 15 g/. The equipment was carried aloft by a Skyhook balloon on August 6, 1954 from Minneapolis, Minnesota (geomagnetic latitude 55°N). A large, thin-walled spherical pulse-ionization chamber served as the detecting instrument. Approximately 125 000 of these cosmic-ray events were recorded over the 25-hour flight interval; thus, statistical counting rate fluctuations were reduced substantially below those previously attained in this field. Analysis shows that approximately one-half of the counting rate at 15 g/ can be ascribed to the medium and heavy nuclei, the remainder being reasonably accounted for as arising from the star-producing component.
No variation is observed in the hourly averaged counting rate of pulses of size greater than 6 Mev throughout the flight, to within the combined statistical and experimental uncertainties of ±4 to 6% during the daytime, and ±8 to 10% during the night.
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