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Cosmic-ray record in solar system matter.

R C Reedy, J R Arnold, D Lal

    Science (New York, N.Y.)
    |January 14, 1983
    PubMed
    Summary
    This summary is machine-generated.

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    Cosmic rays interacting with solar system objects reveal their history. Analysis of nuclides and particle tracks shows past variations in cosmic ray fluxes over millions of years.

    Area of Science:

    • Cosmic ray physics
    • Planetary science
    • Nuclear astrophysics

    Background:

    • Energetic nuclei in cosmic rays interact with solar system bodies like meteoroids, the Moon, and planets.
    • These interactions produce nuclides and heavy nuclei tracks within the target materials.

    Purpose of the Study:

    • To investigate the information contained within cosmic ray-produced nuclides and tracks.
    • To understand the history of solar system objects and variations in particle fluxes.
    • To analyze complex cosmic ray exposure histories of lunar samples and meteorites.

    Main Methods:

    • Analysis of nuclides and heavy nuclei tracks in extraterrestrial materials.
    • Reconstruction of cosmic ray exposure histories.
    • Investigation of erosion, gardening, fragmentation, and orbital changes affecting samples.

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    Main Results:

    • Cosmic ray interactions provide detailed historical records of solar system objects.
    • Evidence suggests temporal and spatial variations in cosmic ray particle fluxes.
    • Complex exposure histories are common in lunar samples and meteorites due to various processes.

    Conclusions:

    • Cosmic ray exposure histories are crucial for understanding solar system evolution.
    • Past solar particle fluxes show variations on timescales of 10^4 to 10^7 years.
    • Further research into galactic cosmic ray flux variations is warranted.