Physics – Plasma Physics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..dppgp1142r&link_type=abstract
American Physical Society, 45th Annual Meeting of the Division of Plasma Physics, October 27-31, 2003, Albuquerque, New Mexico,
Physics
Plasma Physics
Scientific paper
Acceleration of charged particles by the Fermi mechanism is currently considered as the primary source of galactic cosmic rays. The acceleration rate depends both on the ambient and the turbulent magnetic field at a particle gyroradius scale. The latter needs to be generated by accelerated particle themselves in order to ensure acceleration to the energy (10^15 eV) over the lifetime of supernova remnants. The available estimates of the turbulence level are controversial and lead to maximum particle energy ranging between 10^13 -10^17eV. We demonstrate that this acceleration mechanism has a potential to generate also the magnetic field at scales significantly exceeding the particle gyroradius and of an amplitude exceeding the ambient field. Therefore, this large scale field is effectively an ambient field for accelerated particles and can thus substantially speed up acceleration process even if the turbulent field is saturated at or below the Bohm level. The mechanism of field generation is due to the scattering of particle generated waves to longer scales via interaction with the acoustic turbulence generated in the shock precursor.
Diamond Patrick H.
Malkov M. A.
Rozanov V. V.
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