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Title:
Evidence in meteorites for an active early sun
Authors:
Caffe, M. W.; Hohenberg, C. M.; Swindle, T. D.; Goswami, J. N.
Affiliation:
AA(Washington University, Saint Louis, MO), AB(Washington University, Saint Louis, MO), AC(Washington University, Saint Louis, MO), AD(Physical Research Laboratory, Ahmedabad, India)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 313, Feb. 1, 1987, p. L31-L35. Research supported by the Indian Space Research Organization. (ApJL Homepage)
Publication Date:
02/1987
Category:
Lunar and Planetary Exploration; Meteorites
Origin:
STI
NASA/STI Keywords:
Meteoritic Composition, Particle Tracks, Solar Flares, Solar System, Spallation, Argon Isotopes, Neon Isotopes, Solar Activity
Keywords:
METEORITES, SUN, RARE GASES, SPECTROMETRY, SAMPLES, METEORITE, GRAINS, SOLAR FLARES, ION TRACKS, ENRICHMENT, SPALLATION, NEON 21, ARGON 38, IRRADIATION, PROTONS, FLUX, ORIGIN, SOURCE, ISOTOPES, EXPERIMENTS, LABORATORY STUDIES, PROCEDURE, EXPOSURE AGE, CONCENTRATION, MURCHISON, KAPOETA, WESTON, FAYETTEVILLE, CARBONACEOUS CHONDRITES, ACHONDRITES, H CHONDRITES, STONY METEORITES, COSMIC RAYS
DOI:
10.1086/184826
Bibliographic Code:
1987ApJ...313L..31C

Abstract

High-sensitivity noble gas mass-spectrometric analyses of meteorite grains having solar flare heavy ion tracks show large enrichments of spallation-produced Ne-21 and Ar-38 when compared to nonirradiated grains from the same meteorite. The enhanced spallation effects in the irradiated grains are due to irradiation by energetic protons early in the history of the solar system, before compaction of the host meteorite. They require a proton fluence (E greater than 10 MeV) of 10 to the 16th to 10 to the 18th/cu cm. These results are best explained by solar flare irradiation in the early solar system with a proton flux several orders of magnitude higher than contemporary solar flares. The Ne isotopic structure suggests a harder energy spectrum than is characteristic of contemporary flares. These observations provide direct evidence for an active early (T Tauri) sun.

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