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Astrophysics and Space Science

, Volume 59, Issue 2, pp 347–354 | Cite as

Suprathermal Grains: Origin of primary cosmic rays

  • Ajoy Kumar Dasgupta
Article

Abstract

Charged dust grains of radiia≃3×10−6 cm could be a help in understanding the production of primary cosmic ray particles in extensive air showers (EAS). A two-stage acceleration mechanism is proposed in order to accelerate dust grains up to relativistic energy. In the first stage, dust grains acquire suprathermal energy (‘Suprathermal Grains’) by the Fermi mechanism. In the second stage, suprathermal grains attain relativistic energy by the Alfvén magnetic pumping mechanism yielding the primary cosmic ray particles. Ionization loss has been considered to be a most important loss mechanism for charged dust grains in a fully ionized medium. It is suggested that graphite dust grains of intergalactic origin may be responsible for high energy (>1020 eV) cosmic rays.

Keywords

Dust Graphite Relativistic Energy Loss Mechanism Ionization Loss 
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. and Fälthammar, C. G.: 1963,Cosmic Electrodynamics, Oxford University Press.Google Scholar
  2. Bethe, H. A. and Ashkin: 1953,Experimental Nuclear Physics, Vol. 1.Google Scholar
  3. Fermi, E.: 1949,Phys. Rev. 75, 1169.Google Scholar
  4. Greisen, K.: 1966,Phys. Rev. Lett. 16, 748.Google Scholar
  5. Hayakawa, S.: 1972,Astrophys. Space Sci. 16, 238.Google Scholar
  6. Herlofson, S.: 1956,Tellus 8, 269.Google Scholar
  7. Hoyle, F.: 1948,Monthly Notices Roy. Astron. Soc. 108, 372.Google Scholar
  8. Mendis, D. A. and Wickramasinghe, N. C.: 1976,Astrophys. Space Sci. 42, L11.Google Scholar
  9. Parker, E. N. and Tidman, D. A.: 1958,Phys. Rev. 111, 1206.Google Scholar
  10. Spitzer, L.: 1949,Phys. Rev. 76, 583.Google Scholar
  11. Suga, K., Sakuyama, H., Kawaguchi, S. and Hara, T.: 1971, EAS-16,12 Int. Conf. on Cosmic Rays.Google Scholar
  12. Watson, A. A.: 1975,14th Int. Conf. on Cosmic Rays, München, Germany.Google Scholar
  13. Wickramasinghe, N. C.: 1974,Astrophys. Space Sci. 28, L25.Google Scholar

Copyright information

© D. Reidel Publishing Company 1978

Authors and Affiliations

  • Ajoy Kumar Dasgupta
    • 1
  1. 1.Department of Applied Mathematics and AstronomyUniversity CollegeCardiffWales

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