Astrophysics and Space Science

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

Suprathermal Grains: Origin of primary cosmic rays

  • Ajoy Kumar Dasgupta


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.


Dust Graphite Relativistic Energy Loss Mechanism Ionization Loss 
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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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