نتایج جستجو برای: galactic cosmic ray
تعداد نتایج: 349069 فیلتر نتایج به سال:
In this paper we report the first observation in the Southern hemisphere of an energy dependence in the Galactic cosmic ray anisotropy up to a few hundred TeV. This measurement was performed using cosmic ray induced muons recorded by the partially deployed IceCube observatory between May 2009 and May 2010. The data include a total of 33×10 muon events with a median angular resolution of ∼ 3◦ de...
We calculate the angular power spectrum of the galactic synchrotron radiation induced by the small scale fluctuations of the magnetic field and the cosmic ray electron density. Using the observed interstellar magnetic field spectrum, which is consistent with the Komolgorov turbulence model at the relevant scales, we find that Cl ∝ l−3.7. We estimate the cosmic ray electron density fluctuation s...
Abstract We present a new generation of model calculations for cosmogenic production rates in various types solar system bodies. The is based on the spectra primary and secondary particles calculated using INCL++6 code, which most reliable sophisticated code available spallation reactions. Thanks to recent improvements (extending lower higher energies considering light charged as ejectiles proj...
The AGASA and SUGAR extensive air shower cosmic ray detectors both find tantalizing evidence of an anisotropic overabundance of cosmic rays towards the Galactic Center (GC) region that “turns on” around 10 eV. I demonstrate that the anisotropy can be explained by extremely high energy neutrons created near the GC through charge-exchange in proton-proton collisions (where the incident, high ener...
A very energetic cosmic ray of energy about (1.72.6)10 20 eV was observed by the Akeno Giant Air Shower Array (AGASA) on December 3, 1993 from the direction of galactic longitude l=131 and galactic latitude b=-41 within an error circle of 1.0 radius. Shower characteristics such as lateral distribution and arrival time spread of charged particles, and lateral distribution of muons (0.5GeV) are w...
The results of a study to explore variations in cloud cover, over regions that are minimally affected by rainfall and heavy rainfall, and that are coincident with variations in the galactic cosmic ray flux, are presented. Using an extensive record of global satellite derived cloud and rainfall products from the International Satellite Cloud Climatology Project (ISCCP) D1 data series and Xie and...
We present a study of the compatibility of some current models of the diffuse Galactic continuum γrays with EGRET data. A set of regions sampling the whole sky is chosen to provide a comprehensive range of tests. The range of EGRET data used is extended to 100 GeV. The models are computed with our GALPROP cosmic-ray propagation and gamma-ray production code. We confirm that the “conventional mo...
The propagation of Galactic Cosmic Ray nuclei having energies between 100 MeV/nuc and several PeV/nuc is strongly believed to be of diffusive nature. The particles emitted by a source located at a given position in the disk do not pervade the whole Galaxy, but are rather confined to a smaller region whose spatial extension is related to the height of the diffusive halo, the Galactic wind and th...
Recently, the MILAGRO collaboration reported on the detection of a diffuse multiTeV emission from a region of the Galactic disk close to the inner Galaxy. The emission is in excess of what is predicted by conventional models for cosmic ray propagation, which are tuned to reproduce the spectrum of cosmic rays observed locally. By assuming that the excess detected by MILAGRO is of hadronic origin...
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