ACCELERATION AND PARTICLE FIELD INTERACTIONS OF COSMIC RAYS II: CALCULATIONS
A. Tawfik, A. Saleh, M. T. Ghoneim and A. A. Hady
DOI : 10.3844/pisp.2013.29.36
Volume 4, Issue 1
The Ultra High Energy Cosmic Rays (UHECRs) is still a one of the most controversial physical problems, especially that all potential acceleration mechanisms are not entirely able to explain the source of UHECR and their energy scale. Based on our generic acceleration model, that suggests different types of electromagnetic interactions between the cosmic charged particles and the different configurations of the electromagnetic (plasma) fields, UHECR are systematically analyzed. The plasma fields are assumed to vary, either spatially or temporally or both. In this approach, the well-known Fermi accelerations are excluded. But seeking for simplicity, it is assumed that the energy loss due to the different physical processes is negligibly small. The energy available to the plasma sector is calculated in four types of electromagnetic fields. It is found that the drift in a time-varying magnetic field is extremely energetic and the energy scale widely exceeds the Greisen-Zatsepin-Kuzmin (GZK) cutoff. We deduced that the polarization drifts in a time-varying electric field is also able to raise the energy of UHECR to an extreme value. Thus, this type of generic mechanisms seems to be combatiple with the Hillas mechanism. The drift in a spatially-varying magnetic field is almost as strong as the polarization drift. The curvature drift in a non-uniform magnetic field and a vanishing electric field is very weak. It is to be concluded that the studying cosmic charged particle interactions with the different aspects of the cosmic plasmas could be considered as intrinsic sources for UHECR and therefore a remarkable portion of the ultra high energies that are observed in the cosmic rays can be interpreted.
© 2013 A. Tawfik, A. Saleh, M. T. Ghoneim and A. A. Hady. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.