Solar Physics

, Volume 41, Issue 2, pp 449–458 | Cite as

Heavy solar cosmic rays in the January 25, 1971 solar flare

  • Charles J. PellerinJr.


A detailed study of the charge composition of heavy solar cosmic rays measured in the January 25, 1971 solar flare including differential fluxes for the even charged nuclei from carbon through argon is presented. The measurements are obtained for varying energy intervals for each nuclear species in the energy range from 10 to 35 MeV nucleon−1. In addition, abundances relative to oxygen are computed for all the above nuclei in the single energy interval from 15 to 25 MeV nucleon−1. This interval contains measurements for all of the species and as a result requires no spectral extrapolations. An upper limit for the abundance of calcium nuclei is also presented.

These measurements, when combined with other experimental results, enable the energy dependence of abundance measurements as a function of nuclear charge to be discussed. It is seen that at energies above about 10 MeV nucleon−1, the variations of abundance ratios are limited to about a factor of 3 from flare to flare, in spite of large variations in other characteristics of these solar events.


Oxygen Calcium Argon Flare Energy Range 
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  1. Armstrong, T. P. and Krimigis, S. M.: 1971, J. Geophys. Res. 76, 4230.Google Scholar
  2. Armstrong, T. P., Krimigis, S. M., Reames, D. V., and Fichtel, C. E.: 1972, J. Geophys. Res. 77, 3607.Google Scholar
  3. Bertsch, D. L., Fichtel, C. E., and Reames, D. V.: 1972, Astrophys. J. 171, 169.Google Scholar
  4. Bertsch, D. L., Fichtel, C. E., Pellerin, C. J., and Reames, D. V.: 1973a, Astrophys. J. 180, 583.Google Scholar
  5. Bertsch, D. L., Biswas, S., Fichtel, C. E., Pellerin, C. J., and Reames, D. V.: 1973b, Solar Phys. 31, 247.Google Scholar
  6. Bertsch, D. L., Biswas, S., and Reames, D. V.: 1974, NASA X-662-74-32, submitted to Solar Physics.Google Scholar
  7. Biswas, S., Fichtel, C. E., and Guss, D. E.: 1962, Phys. Rev. 128, 2756.Google Scholar
  8. Biswas, S., Fichtel, C. E., Guss, D. E., and Waddington, C. J.: 1963, J. Geophys. Res. 68, 3109.Google Scholar
  9. Biswas, S., Fichtel, C. E., and Guss, D. E.: 1966, J. Geophys. Res. 71, 4071.Google Scholar
  10. Braddy, D., Chan, J., and Price, P. B.: 1973, Phys. Rev. Letters 30, 669.Google Scholar
  11. Cameron, A. G. W.: 1973, Space Sci. Rev. 15, 121.Google Scholar
  12. Crawford, H. J., Price, P. B., and Sullivan, J. D.: 1972, Astrophys. J. 175, L149.Google Scholar
  13. Fichtel, C. E. and Guss, D. E.: 1961, Phys. Rev. Letters 6, 495.Google Scholar
  14. Ginzburg, V. L. and Syrovatskii, S. I.: 1964, The Origin of Cosmic Rays, Macmillan Company, New York.Google Scholar
  15. Heckman, H. H., Hubbard, E. L., and Simon, W. G.: 1963, Phys. Rev. 129, 1240.Google Scholar
  16. Hovestadt, D., Vollmer, O., Gloeckler, G., and Fan, C. Y.: 1973, 13th Int. Conf. on Cosmic Rays, Denver 2, 1498.Google Scholar
  17. Krimigis, S. M. and Armstrong, T. P.: 1973, 13th Int. Conf. on Cosmic Rays, Denver 2, 1504.Google Scholar
  18. Mason, B.: 1971, Handbook of Elemental Abundances in Meteorites, Gordon & Breach Science Publishers, New York.Google Scholar
  19. Mogro-Campero, A. and Simpson, J. A.: 1972, Astrophys. J. 171, L5.Google Scholar
  20. Nakada, M. P.: 1970, Solar Phys. 14, 457.Google Scholar
  21. Pellerin, C. J.: 1974, Ph.D. Thesis, Catholic University of America.Google Scholar
  22. Price, P. B., Chan, J. H., Crawford, H. J., and Sullivan, J. D.: 1973, 13th Int. Conf. on Cosmic Rays, Denver 2, 1479.Google Scholar
  23. Teegarden, B. J, von Rosenvinge, T. R., and McDonald, F. B.: 1973, Astrophys. J. 180, 571.Google Scholar
  24. Withbroe, G. L.: 1971, in K. B. Gebbie (ed.), The Menzel Symposium on Solar Physics, Atomic Spectra, and Gaseous Nebulae, NBS Spec. Pub. 353, p. 127.Google Scholar

Copyright information

© by D. Reidel Publishing Company 1975

Authors and Affiliations

  • Charles J. PellerinJr.
    • 1
  1. 1.NASA/Goddard Space Flight CenterGreenbeltU.S.A.

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