Cosmic Rays and the Sunspot Cycle: Primary α-Particle Intensity at Sunspot Maximum

@article{Freier1958CosmicRA,
  title={Cosmic Rays and the Sunspot Cycle: Primary $\alpha$-Particle Intensity at Sunspot Maximum},
  author={Phyllis S. Freier and Edward P. Ney and Peter Howard Fowler},
  journal={Nature},
  year={1958},
  volume={181},
  pages={1319-1321}
}
BS>In a series of balloon experiments, emulsion packages were included in each flight to allow the determination of the alpha -particle flux and energy spectrum at those times when total ionization or counting measurements showed that the total intensity had undergone a significant change. The decrease in the total intensity during the summer of 1957 was recorded in a number of flights in which satisfactory exposures were obtained. One flight made on May 
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Abstract An experiment has been carried out at Saskatoon, Canada, at a nominal geomagnetic latitude of 60.5°N, which shows the form of the low energy end of the cosmic ray alpha particle spectrum