Solar proton fluxes during the last million years

Physics

Scientific paper

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Aluminum 26, Lunar Rocks, Particle Tracks, Proton Flux Density, Solar Flux, Solar Protons, Abundance, Cosmic Rays, Heavy Nuclei, Rare Gases, Solar Activity, Solar Flares

Scientific paper

The solar flare proton fluxes, averaged over different periods of time, have been determined from Al-26 measured in five selected lunar rocks. The time of exposure of these rocks, ranging from 0.5 to 3.8 million years, were deduced from track profiles due to galactic-cosmic-ray heavy nuclei and from rare-gas data. The observed production rates of Al-26 in all the rocks is in close agreement, implying little variation in average solar flare proton intensity during the past 0.5-, 1-, and 1.5-million-year periods. If the fluxes of solar flare protons and thermal radiation are related, these data exclude any significant changes in solar luminosity during the Pleistocene.

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