Ballistic and diffusive components of the dynamic spectra of ultra high energy cosmic rays from nearby transient sources
|1Fedorov, YI, 2Gnatyk, RB, 2Hnatyk, BI, Kolesnyk, YI, 1Shakhov, BA, 2Zhdanov, VI |
1Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
2Astronomical Observatory of Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
|Kinemat. fiz. nebesnyh tel (Online) 2016, 32(3):3-25|
|Start Page: Space Physics|
Ultra high energy cosmic rays (UHECR, E > 1018 eV) from extragalactic sources deviate in the Galactic and intergalactic magnetic fields that lead to the diffusive character of their propagation, isotropization of their total flux and to the absence of clus-ers of UHECRs, associated with the individual sources.Extremely high energy cosmic rays (E > 1019.7 eV) are scattered mainly on localized magnetized structures: galaxy clusters, filaments, etc. with a mean free path of tens of Mpc, therefore, in the case of close transient sources the significant contribution of unscattered and weakly scattered particles to the observed flux is expected, that could be the determining factor in the identification of such sources. We propose a method for calcu-ating the time evovution of the UHECR energy spectra based on analytical solutions of the transport equation with explicit determination of contribution of scattered and unscattered particles. As examples, we consider the transient activity of the closest active galactic nucleus Centaurus A and acceleration of UHECRs by young millisecond pulsar.
|Keywords: evolution of the energy spectra, transient sources, Ultra high energy cosmic rays|
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