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Astrophysics and Space Science

, Volume 144, Issue 1–2, pp 337–346 | Cite as

Temporal variations of low-energy cosmic-ray protons on decadal and million year time-scales: Implications to their origin

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Abstract

We discuss the present day information on the prehistoric proton radiation in the solar system at 1 AU based on activation of lunar surface materials, in relation to our present day knowledge of their contemporary fluxes in solar flare events and during quiet time. The bulk of the prehistoric radiation can be attributed to its origin in solar flares. Its energy spectrum is, however, harder than the solar flare radiation observed during solar cycles 19, 20, and 21 (1954–1986). The implications of the data to other sources of particles and/or acceleration mechanisms in the interplanetary region are discussed.

Keywords

Radiation Temporal Variation Flare Energy Spectrum Solar System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Alfvén, H.: 1949,Phys. Rev. 75, 1732.Google Scholar
  2. Alfvén, H.: 1981,Cosmic Plasma, D. Reidel Publ. Co., Dordrecht, Holland.Google Scholar
  3. Axford, W. I.: 1981, ‘Origin of Cosmic Rays’, in G. Setti, G. Spada, and A. W. Wolfendale (eds.),IAU Symp. 94, 339.Google Scholar
  4. Axford, W. I.: 1985, n F. D. Kahn (ed.),Cosmical Gas Dynamics, VNU press, p. 119.Google Scholar
  5. Barnes, G. W. and Simpson, J. A.: 1976,Astrophys. J. 210, L91.Google Scholar
  6. Beer, H. F., Käppeler, F., Reffo, G., and Venturini, G.: 1983,Astrophys. Space Sci. 97, 95.Google Scholar
  7. Biswas, S. and Fichtel, C. E.: 1965,Space Sci. Rev. 4, 709.Google Scholar
  8. Duggal, S. P.: 1979,Rev. Geophys. Space Phys. 17, 1021.Google Scholar
  9. Garcia-Munoz, M., Mason, G. M., and Simpson, J. A.: 1975,Astrophys. J. 202, 265.Google Scholar
  10. Goswami, J. N., Jha, R., and Lal, D.: 1981,J. Astrophys. Astron. 2, 201.Google Scholar
  11. Goswami, J. N., McGuire, R. E., Reedy, R. C., Lal, D., and Jha, R.: 1988,J. Geophys. Res. (in press).Google Scholar
  12. Jokipii, J. R.: 1968,Astrophys. J. 152, 799.Google Scholar
  13. Lal, D.: 1972,Space Sci. Rev. 14, 3.Google Scholar
  14. Lal, D.: 1972,Phil. Trans. Roy. Soc. London A285, 69.Google Scholar
  15. Lanzerotti, L. J.: 1977, in O. R. White (ed.),The Solar Output and Its Variation, Colorado Assoc. Univ. Press, Boulder, pp. 383–403.Google Scholar
  16. Lingenfelter, R. E. and Hudson, H. S.: 1980, in R. O. Pepin, J. A. Eddy, and R. B. Merrill (eds.),Proc. Conf. on Ancient Sun, Pergamon, New York, pp. 69–79.Google Scholar
  17. McDonald, F. B., Teegarden, B. J., Trainor, J. H., von Rosenvinge, T. T., and Webber, W. R.: 1976,Astrophys. J. 203, L149.Google Scholar
  18. Morral, H. and Axford, W. I.: 1983,Astron. Astrophys. 125, 204.Google Scholar
  19. Pomerantz, M. A. and Duggal, S. P.: 1974a,Rev. Geophys. Space Phys. 12, 343.Google Scholar
  20. Pomerantz, M. A. and Duggal, S. P.: 1974b,J. Geophys. Res. 79, 913.Google Scholar
  21. Reedy, R. C.: 1977,Proc. Lunar Sci. Conf. 8th, Pergamon, New York, pp. 825–839.Google Scholar
  22. Reedy, R. C.: 1980, in R. O. Pepin, J. A. Eddy, and R. B. Merrill (eds.)Proc. Conf. on Ancient Sun, Pergamon, New York, pp. 365–386.Google Scholar
  23. Reedy, R. C., Arnold, J. R., and Lal, D.: 1983,Science 219, 127.Google Scholar
  24. Simpson, J. A.: 1978,Astron. Aeronautics 16, 96.Google Scholar
  25. Tsurutani, B. T., Smith, E. J., Pyle, K. R., and Simpson, J. A.: 1982,J. Geophys. Res. 87 (A9), 7389.Google Scholar
  26. Van Hollebeke, M. A. I., Ma Sung, L., and McDonald, F. B.: 1975,Solar Phys. 41, 189.Google Scholar
  27. Wdowczyk, J. and Wolfendale, A. W.: 1977,Int. Cosmic Ray Conf. 15th Conf. Papers 5, 270.Google Scholar
  28. Webb, G. M., Forman, M. A., and Axford, W. I.: 1985,Astrophys. J. 298, 684.Google Scholar
  29. Webber, W. R., Benbrook, J. R., Thomas, J. R., Hunting, A., and Duncan, R.: 1963,An Evaluation of the Radiation Hazard Due to Solar-Particle Events, Boeing Co. Report D2-90406 (NTIS Document No AD-805442), 109 pp.Google Scholar

Copyright information

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • D. Lal
    • 1
    • 2
  1. 1.Scripps Institution of OceanographyLa JollaUSA
  2. 2.Physical Research LaboratoryAhmedabadIndia

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