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Long-term variations of fluxes of solar protons and helium isotopes

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Abstract

The fluxes of hydrogen and helium isotopes in the solar wind are reconstructed over a long time scale since the present time up to 600 million years back. Abundances of helium isotopes, obtained in the helium isotopic analysis made for 8 lunar soil samples, were used as initial data in the reconstruction procedure. Samples were taken off from various levels of the 1.6-m core of lunar soil delivered by the automatic Luna-24 station in 1976. The data on modern hydrogen and helium fluxes were used as well. The developed reconstruction procedure allowed one to select various solar wind components in a “gross” composition. Proton flux variations over the interval of 600 million years do not exceed a value of 40 %. Helium flux variations reach a value of 1.5–2 relative to the average value. Most likely, this circumstance is caused by considerable variations of a number of coronal mass ejections (CME) enriched by helium. The arguments in favor of solar activity polycyclicity on a long time scale are discussed.

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Authors and Affiliations

  1. Ioffe Physical-Technical Institute of the Russian Academy of Sciences, 194021, St.-Petersburg, Russia

    G. S. Anufriev

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  1. G. S. Anufriev
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Correspondence to G. S. Anufriev.

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Original Russian Text © G.S. Anufriev, 2012, published in Kosmicheskie Issledovaniya, 2012, Vol. 50, No. 6, pp. 435–440.

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Anufriev, G.S. Long-term variations of fluxes of solar protons and helium isotopes. Cosmic Res 50, 405–409 (2012). https://doi.org/10.1134/S0010952512060019

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