Lunar radionuclide records of average solar-cosmic-ray fluxes over the last ten million years

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Because changes in solar activity can modify the fluxes of cosmic-ray particles in the solar system, the nature of the galactic and solar cosmic rays and their interactions with matter are described and used to study the ancient sun. The use of cosmogenic nuclides in meteorites and lunar samples as detectors of past cosmic-ray variations are discussed. Meteorite records of the history of the galactic cosmic rays are reviewed. The fluxes of solar protons over various time periods as determined from lunar radionuclide data are presented and examined. The intensities of solar protons emitted during 1954 to 1964 (11-year solar … continued below

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44 pages

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Reedy, R. C. March 21, 1980.

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Because changes in solar activity can modify the fluxes of cosmic-ray particles in the solar system, the nature of the galactic and solar cosmic rays and their interactions with matter are described and used to study the ancient sun. The use of cosmogenic nuclides in meteorites and lunar samples as detectors of past cosmic-ray variations are discussed. Meteorite records of the history of the galactic cosmic rays are reviewed. The fluxes of solar protons over various time periods as determined from lunar radionuclide data are presented and examined. The intensities of solar protons emitted during 1954 to 1964 (11-year solar cycle number 19) were much larger than those for 1965 to 1975 (solar cycle 20). Average solar-proton fluxes determined for the last one to ten million years from lunar /sup 26/Al and /sup 53/Mn data show little variation and are similar to the fluxes for recent solar cycles. Lunar activities of /sup 14/C (and preliminary results for /sup 81/Kr) indicate that the average fluxes of solar protons over the last 10/sup 4/ (and 10/sup 5/) years are several times larger than those for the last 10/sup 6/ to 10/sup 7/ years; however, cross-section measurements and other work are needed to confirm these flux variations.

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44 pages

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Dep. NTIS, PC A03/MF A01.

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  • Lunar and Planetary Institute topical conference on the ancient sun, Boulder, CO, USA, Oct 1979

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  • Report No.: LA-UR-80-928
  • Report No.: CONF-7910123-4
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5517825
  • Archival Resource Key: ark:/67531/metadc1087648

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  • March 21, 1980

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  • Feb. 10, 2018, 10:06 p.m.

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  • Feb. 10, 2021, 10:38 p.m.

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Reedy, R. C. Lunar radionuclide records of average solar-cosmic-ray fluxes over the last ten million years, article, March 21, 1980; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1087648/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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