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The Quiet Time Spectra of Low Energy Hydrogen and Helium Nuclei

Mewaldt, R. A. and Stone, E. C. and Vogt, R. E. (1975) The Quiet Time Spectra of Low Energy Hydrogen and Helium Nuclei. In: Proceedings of the 14th International Cosmic Rays Conference. Vol.2. Max Planck Gesellschaft , pp. 774-779.

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Measurements of the 1972-1973 quiet time hydrogen and helium spectra from 1.3-40 MeV/nuc are discussed. For both spectra the relative-intensity minimum occurs at lower energies than those reported for earlier years. There is no evidence of a low energy turnup in the He spectrum down to 2.4 MeV/nuc. The spectra indicate that the galactic component dominates down to about 10 MeV; a stable, non-solar He-4 component extends from higher energies down to about 2.4 MeV/nuc. At lower energies the periods of minimum H and He intensity do not coincide, and the relative abundance of H and He at 1.3-2.3 MeV/nuc is variable, with H/He ratios ranging from about 3 to about 10. The observations suggest that the 1.3-2.3 MeV/nuc protons and alphas are of solar origin.

Item Type:Book Section
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Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
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Additional Information:This work was supported in part by the National Aeronautics and Space Administration under Contract NAS5-11066 and Grant NGR 05-002-160.
Group:Space Radiation Laboratory
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NASANGR 05-002-160
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Space Radiation Laboratory1975-03
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ID Code:44851
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Deposited On:14 Apr 2014 23:21
Last Modified:20 Feb 2020 14:33

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