نتایج جستجو برای: cosmic ray
تعداد نتایج: 325747 فیلتر نتایج به سال:
Gamma-ray bursts are known to be sources of high-energy γ rays, and are likely to be sources of high-energy cosmic rays and neutrinos. Following a short review of observations of GRBs at multi-MeV energies and above, the physics of leptonic and hadronic models of GRBs is summarized. Evidence for two components in BATSE and EGRET/TASC data suggest that GRBs are sources of high-energy cosmic rays...
The well established cosmic ray transport equation describes the physics of cosmic ray modulation in the heliosphere and is thought to be complete. Its solution for anomalous cosmic rays has special characteristics due to the local acceleration of these particles at the solar wind termination shock. Some of these characteristics are demonstrated here, namely effects by the strength of the shock...
A search was conducted for TeV -rays emitted from the direction of the ultra–high-energy cosmic ray detected by the Fly’s Eye experiment with energy E 3 1020 eV. No enhancement was found at a level of 10 10 cm 2 s 1 for E > 350 GeV. A steady source of ultra–high-energy cosmic ray protons or photons would be expected to produce a -ray flux above this level. An upper limit was also set for the fl...
The individual energy spectra and relative abundances measured with TRACER, are compared with previous measurements in space and balloons, and with interpretations of air shower data. From the individual spectral slopes, we discuss constraints on models of cosmic-ray propagation through the galaxy. We also discuss the extrapolated high-energy abundances of the elements at the cosmic ray sources...
We consider γ-ray emission from heavy nuclei that are accelerated in the shocks of stellar winds and are excited in interactions with the ambient matter in the Orion complex. We show that the recent detection of γ-ray lines in the Orion complex by COMPTEL telescope can be explained by such a scenario, assuming cosmic abundances. The scenario is consistent with recent models of cosmic ray accele...
We present new measurements of heavy cosmic-ray nuclei at high energies performed during the first flight of the balloon-borne cosmic-ray experiment CREAM (Cosmic-Ray Energetics And Mass). This instrument uses multiple charge detectors Preprint submitted to Elsevier 12 August 2008 and a transition radiation detector to provide the first high accuracy measurements of the relative abundances of e...
There is evidence that cosmic rays were present in galaxies at moderately high redshift. This suggests that magnetic fields were also present. If cosmic rays and magnetic fields must always be close to equipartition, as they are to an order of magnitude within the local universe, this would provide a powerful constraint on theories of the origin and evolution of magnetic fields in galaxies. We ...
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