Computer Science
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975rspta.277..381e&link_type=abstract
(Royal Society, Discussion on the Origin of the Cosmic Radiation, London, England, Feb. 20, 21, 1974.) Royal Society (London), P
Computer Science
4
Anisotropy, Cosmic Ray Showers, Galactic Radiation, Magnetic Rigidity, Particle Flux Density, Primary Cosmic Rays, Radiation Distribution, Heavy Nuclei, Interplanetary Magnetic Fields, Proton Flux Density, Solar Cycles
Scientific paper
At the present time there is no generally accepted evidence for any statistically significant anisotropy in the energy range from 100,000 to 10,000,000 TeV. The upper limits on the possible anisotropy provide strong evidence that these particles are extragalactic. In that part of the cosmic-ray magnetic rigidity spectrum below about 200 GV, the interplanetary magnetic field effectively prevents the detection of anisotropies in interstellar space and the only isotropies measured are associated with the solar wind and its associated magnetic field. In the range of magnetic rigidities extending from 100 GV to 1 TV the cosmic-ray intensity shows evidence for a small anisotropy of about .0002 which can be explained as the result of solar motion relative to the average galactic rotation in our neighborhood. When this is removed, the residual deviations from the mean intensity preclude any systematic sinusoidal variation greater than .0002. This high degree of isotropy is most easily understood if these particles are members of an extragalactic population, and it is suggested that this extragalactic component predominates from the highest cosmic-ray energies down the spectrum at least as far as about 100 GV rigidity.
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