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Abundances and Acceleration Mechanisms of Cosmic Rays


MEASUREMENTS of the chemical composition of cosmic rays1 have shown that for most elements the abundances roughly correspond to their universal abundances. I wish to point out here that some systematic differences occur in the low energy range, which are correlated with the first ionization potentials of the corresponding elements.

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  1. 1

    Meyer, P., Ann. Rev. Astron. and Astrophys., 7, 1 (1969).

  2. 2

    Unsöld, A. O. J., Science, 163, 1015 (1969).

  3. 3

    Comstock, G. M., Astrophys. J., 155, 619 (1969).

  4. 4

    Pottasch, S. R., in Abundance Determinations in Stellar Spectra (Intern. Astron. Symp. Union, No. 26) (edit. by Hubenet, H.), 200 (Academic Press, 1966).

  5. 5

    Garz, T., Holweger, A., Kock, M., and Richter, J., Astron. and Astrophys., 2, 446 (1968).

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