منابع مشابه
Acceleration of Cosmic Rays at Cosmic Shocks
Nonthermal particles can be produced due to incomplete thermalization at collisionless shocks and further accelerated to very high energies via diffusive shock acceleration. In a previous study we explored the cosmic ray (CR) acceleration at cosmic shocks through numerical simulations of CR modified, quasi-parallel shocks in 1D plane-parallel geometry with the physical parameters relevant for t...
متن کاملAcceleration of Ultra High Energy Cosmic Rays
Some general features of cosmic ray acceleration are summarized along with some inferences that can be drawn concerning the origin of the UHE component. The UHE luminosity density is found to be similar to that derived for GeV cosmic rays and its slope suggests a distinct origin. Reports of clustering on small angular scale, if confirmed, would rule out most proposed source models. More general...
متن کاملAcceleration of Ultra High Energy Cosmic Rays: Cosmic Zevatrons?
In this lecture I outline some of the underlying physics issues associated with accelerators plausibly capable of explaining the UHECRs up to ZeV energies. I concentrate on the mechanisms and their constraints, but provide a brief background on observations and the constraints they supply, as well.
متن کاملCosmic rays acceleration at ultrarelativistic subshocks
We present the model of cosmic rays acceleration at ultrarelativistic subshocks and confront it with the observations of gamma-ray bursts (GRBs) and blazars. We investigate cosmic rays acceleration in shocks with Lorentz factors (γ) in the range 3 40. We show that fluctuations of the magnetic field downstream of the shock do not play an important role in the acceleration process. Results of num...
متن کاملShock acceleration of cosmic rays—a critical review
Motivated by recent unsuccessful efforts to detect the predicted flux of TeV gamma-rays from supernova remnants, we present a critical examination of the theory on which these predictions are based. Three crucial problems are identified: injection, maximum achievable particle energy and spectral index. In each case significant new advances in understanding have been achieved, which cast doubt o...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2008
ISSN: 1742-6596
DOI: 10.1088/1742-6596/120/6/062003