Results 41 to 50 of about 69,000 (198)

Origin of very high and ultra high energy cosmic rays [PDF]

open access: yes, 2014
While there is some level of consensus on a Galactic origin of cosmic rays up to the knee ($E_{k}\sim 3\times 10^{15}$ eV) and on an extragalactic origin of cosmic rays with energy above $\sim 10^{19}$ eV, the debate on the genesis of cosmic rays in the ...
Blasi, Pasquale
core   +2 more sources

The Dipole Anisotropy of Galactic Cosmic Rays [PDF]

open access: yes, 2018
The arrival directions of Galactic cosmic rays exhibit anisotropies up to the level of one per-mille over various angular scales. Recent observations of TeV-PeV cosmic rays show that the dipole anisotropy has a strong energy dependence with a phase-flip ...
Ahlers, Markus
core   +2 more sources

The galactic cosmic ray ionization rate [PDF]

open access: yesProceedings of the National Academy of Sciences, 2006
The chemistry that occurs in the interstellar medium in response to cosmic ray ionization is summarized, and a review of the ionization rates that have been derived from measurements of molecular abundances is presented. The successful detection of large abundances of H 3 + in diffuse clouds and the ...
openaire   +2 more sources

Selected Topics in Cosmic Ray Physics

open access: yes, 2017
The search for the origin of cosmic rays is as active as ever, mainly driven by new insights provided by recent pieces of observation. Much effort is being channelled in putting the so called supernova paradigm for the origin of galactic cosmic rays on ...
Aloisio, R.   +3 more
core   +1 more source

Cosmic Rays from Active Galactic Nuclei [PDF]

open access: yesThe Astrophysical Journal, 2008
Cosmic ray (CR) acceleration at the shock created by the expanding cocoons around active galactic nuclei (AGNs) is studied. It is shown that above the energy $10^{18}$ eV the overall energy spectrum of CRs, produced during the AGN evolution and released in the intergalactic space, has the form $N\propto ^{- }$, with $ \approx 2.6$, which extends up
openaire   +2 more sources

Theoretical challenges in acceleration and transport of ultra high energy cosmic rays: A review

open access: yesEPJ Web of Conferences, 2013
The wealth of data collected in the last few years thanks to the Pierre Auger Observatory and recently to the Telescope Array made the problem of the origin of ultra high energy cosmic rays a genuinely experimental/observational one.
Blasi Pasquale
doaj   +1 more source

Cosmic Ray Acceleration in Supernova Remnants

open access: yes, 2010
We review the main observational and theoretical facts about acceleration of Galactic cosmic rays in supernova remnants, discussing the arguments in favor and against a connection between cosmic rays and supernova remnants, the so-called supernova ...
Blasi, Pasquale
core   +1 more source

The origin of galactic cosmic rays [PDF]

open access: yesThe Astronomy and Astrophysics Review, 2013
88 Pages, Review paper to appear in A&A Reviews - A typo ...
openaire   +2 more sources

Searches for Neutrinos from Large High Altitude Air Shower Observatory Ultra-high-energy γ-Ray Sources Using the IceCube Neutrino Observatory

open access: yesThe Astrophysical Journal Letters, 2023
Galactic PeV cosmic-ray accelerators (PeVatrons) are Galactic sources theorized to accelerate cosmic rays up to PeV in energy. The accelerated cosmic rays are expected to interact hadronically with nearby ambient gas or the interstellar medium, resulting
R. Abbasi   +389 more
doaj   +1 more source

Shape of spectrum of galactic cosmic ray intensity fluctuations

open access: yesSolar-Terrestrial Physics, 2022
The impact of solar wind plasma on fluxes of galactic cosmic rays (CR) penetrating from the outside into the heliosphere with energies above ~1 GeV leads to temporal variations in the CR intensity in a wide frequency range.
Starodubtsev S. A.
doaj   +1 more source

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