Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235l..95m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 235, Jan. 15, 1980, p. L95-L99.
Astronomy and Astrophysics
Astronomy
32
Abundance, Cosmic Rays, Galactic Radiation, Magnesium Isotopes, Neon Isotopes, Silicon Isotopes, International Sun Earth Explorer 3, Solar System, Spaceborne Astronomy
Scientific paper
High-resolution measurements of the abundances of individual isotopes of neon, magnesium and silicon in galactic cosmic rays are reported. The Caltech Heavy Isotope Spectrometer Telescope on board the ISEE 3 spacecraft was used to obtain measurements in the range 30 to 180 MeV/n at an rms mass resolution of 0.20 amu. Results indicate excesses of Ne-22 as well as Mg-25 and Mg-26 in galactic cosmic rays with respect to their solar system abundances. Calculations of the effects of interstellar propagation and solar modulation on cosmic-ray isotope abundances also imply an Mg-25 + Mg-26 cosmic ray source fraction significantly greater than the solar system fraction, and it is suggested that the cosmic ray source material and solar system material were synthesized under different conditions.
Mewaldt Richard A.
Spalding J. D.
Stone Edward C.
Vogt Rochus E.
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