Galactic modulation of extragalactic cosmic rays − Alternative scenario of the origin of the knee −
نویسندگان
چکیده
Recently we have shown that the observed knee structure is reproduced well by a superposition of the hypothetical extragalactic cosmic rays modulated by the galactic wind and the galactic cosmic rays originating in supernova remnants. We reexamine this model assuming the chemical composition of the hypothetical extragalactic cosmic rays is the same as that of the galactic cosmic rays of supernova origin. The knee structure is reproduced well again. The energy dependence of mean mass of cosmic rays above the knee energy is presented to be compared with observations.
منابع مشابه
Galactic modulation of extragalactic cosmic rays: Possible origin of the knee in the cosmic ray spectrum
The existence of the spectral break around ∼ 3 × 10 eV in the cosmic ray spectrum (referred to as the ‘knee’) is one of the biggest questions in cosmic ray astrophysics. At the same time, the origin of cosmic rays above the knee energies (between 10 and 10 eV) is also still unsettled. In this paper, we investigate how the hypothetical extragalactic CRs after modulated by the galactic wind contr...
متن کاملAn extragalactic “flux trapping” origin of the dominant part of hadronic cosmic rays?
An extragalactic origin of the dominant part of all extrasolar hadronic cosmic rays above about 10MeV/nucleon has long been considered unlikely due to energy considerations. In order to circumvent such arguments, the hypothesis that “flux trapping” of extragalactic cosmic rays occurs in the Galactic confinement volume is advanced in this paper. This hypothesis is based on a number of speculativ...
متن کاملDetailed analysis of observed antiprotons in cosmic rays
In the present work, the origin of antiprotons observed in cosmic rays (above the atmosphere) is analyzed in details. We have considered the origin of the primaries, (which their interactions with the interstellar medium is one of the most important sources of antiprotons) is a supernova type II then used a diffusion model for their propagation. We have used the latest parameterization for anti...
متن کاملPropagation and Chemical Composition of Ultra High Energy Cosmic Rays
Extragalactic cosmic ray protons with an injection spectrum of the typeE show a spectrum on earth with a dip due to the Bethe-Heitler pair production against the photons of the cosmic microwave background. The dip is produced in the energy region 10 − 4 × 10 eV with position and shape that reproduce with high accuracy the spectrum observed experimentally. This interpretation of the observed dat...
متن کاملCosmic Rays from the Knee to the Ankle – Status and Prospects
Recent progress in cosmic ray physics covering the energy range from about 10 eV to 10 eV is reviewed. The most prominent features of the energy spectrum are the so called ‘knee’ at E ≃ 3 · 10 eV and the ‘ankle’ at few 10 eV. Generally, the origin of the knee is understood as marking the limiting energy of galactic accelerators and/or the onset of increasing outflow of particles from the galaxy...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2006