# 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}
}
• Published 10 May 1958
• Physics
• Nature
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
16 Citations

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## References

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### The low energy end of the cosmic ray spectrum of alpha-particles

• Physics
• 1957
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