منابع مشابه
Energies of Cosmic-Ray Particles
Cloud chamber photographs of cosmic-ray tracks in a magnetic field up to 17,000 gauss are shown. On the assumption that the particles producing the tracks are travelling downward through the chamber rather than upward, particles of positive charge appear as well as electrons. From the specific ionization along the track it is concluded that the positives are protons, and are not nuclei of charg...
متن کامل0 A Central Engine for Cosmic Gamma - Ray Burst Sources
One of a family previously proposed " central engines " for cosmic gamma-ray burst sources (Klu´zniak & Ruderman 1998) is considered in some detail. A steadily accreting 10 6 Gauss magnetic white dwarf should ultimately collapse to a strongly differentially rotating, millisecond-rotation-period neutron star for a wide range of steady accretion rates and initial masses if the accreting white dwa...
متن کاملA simplified model for the acceleration of cosmic ray particles
Two important questions concerning cosmic rays are: Why are electrons in the cosmic rays less efficiently accelerated than nuclei? How are particles accelerated to great energies in ultra-high energy cosmic rays? In order to answer these questions we construct a simple model of the acceleration of a charged particle in the cosmic ray. It is not meant as a detailed model, which is expected to be...
متن کاملA Gamma-ray Burst/pulsar for Cosmic-ray Positrons with a Dark Matter-like Spectrum
We propose that a nearby gamma-ray burst (GRB) or GRB-like (old, single and short-lived) pulsar/microquasar about 105−6 years ago may be responsible for the excesses of cosmic-ray positrons and electrons recently observed by the PAMELA, ATIC/PPB-BETS, Fermi and HESS experiments. We can reproduce the smooth Fermi/HESS spectra as well as the spiky ATIC/PPB-BETS spectra. The spectra have a sharp c...
متن کاملTime Delays in Cosmic Ray Propagation
Cosmic Rays (CR) travel at speeds essentially indistinguishable from the speed of light. However whilst travelling through magnetic fields, both regular and turbulent, they are delayed behind the light since they are usually charged particles and their paths are not linear. Those delays can be so long that they are an impediment to correctly identifying sources which may be variable in time. Fu...
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ژورنال
عنوان ژورنال: Nature
سال: 1939
ISSN: 0028-0836,1476-4687
DOI: 10.1038/143682a0