Results 61 to 70 of about 69,000 (198)

Overview on direct and indirect measurements of cosmic rays - Some thoughts on galactic cosmic rays and the knee

, 2005
An overview is given on results from direct and indirect measurements of galactic cosmic rays. Their implications on the contemporary understanding of the origin of cosmic rays and the knee in their energy spectrum are discussed.Comment: Invited overview,
Hoerandel, Joerg R.
core   +2 more sources

GZK Violation - a Tempest in a (Magnetic) Teapot? [PDF]

, 2000
The apparent lack of suitable astrophysical sources for the observed highest energy cosmic rays (UHECRs) within $\approx 20$ Mpc is the "GZK Paradox". We constrain representative models of the extra-galactic magnetic field structure by Faraday Rotation ...
Farrar, Glennys R., Piran, Tsvi
core   +2 more sources

Investigating the Cosmic-Ray Ionization Rate Near the Supernova Remnant IC 443 Through H3+ Observations [PDF]

, 2010
Observational and theoretical evidence suggests that high-energy Galactic cosmic rays are primarily accelerated by supernova remnants. If also true for low-energy cosmic rays, the ionization rate near a supernova remnant should be higher than in the ...
Abdo, Acciari, Albert, Benjamin J. McCall, Brian D. Fields, Burgh, Burton, Chevalier, Claussen, Cornett, Drury, Geballe, Geoffrey A. Blake, Goto, Hewitt, Hewitt, Hirschauer, Indriolo, Indriolo, Inoue, Lodders, Lord, Mattila, Miwa Goto, Neufeld, Nick Indriolo, Padoan, Rachford, Reville, Rho, Sheffer, Skilling, Snell, Sofia, Sonnentrucker, T. R. Geballe, Takeshi Oka, Tavani, Tomonori Usuda, Troja, van Dishoeck, Webber, White, White, Yusef-Zadeh, Zhang   +45 more
core   +2 more sources

Transition from galactic to extra-galactic cosmic rays

Journal of Physics: Conference Series, 2006
3 pages, 2 eps figures, talk given at TAUP 2005, Zaragoza (Spain), 10-14 September ...
openaire   +2 more sources

A Rigorous Solution to the Superluminal Issue in the Diffusion Equation

The Astrophysical Journal
Superluminal propagation is an intrinsic problem in the diffusion equation and has not been effectively addressed for a long time. In this work, a rigorous solution to this issue is obtained under the assumption that particles undergo a random flight ...
Xing-Jian Lv, Xiao-Jun Bi, Kun Fang, Peng-Fei Yin, Meng-Jie Zhao   +4 more
doaj   +1 more source

Spectrum and mass composition of cosmic rays in the energy range 1015–1018 eV derived from the Yakutsk array data

EPJ Web of Conferences, 2013
A spectrum of cosmic rays within energy range 1015 − 3 × 1017 eV was derived from the data of the small Cherenkov setup, which is a part of the Yakutsk complex EAS array. In this, work a new series of observation is covered.
Sabourov A., Knurenko S.P.
doaj   +1 more source

Cosmic-ray protons, nuclei, electrons, and antiparticles under a two-halo scenario of diffusive propagation

, 2015
We report calculations of cosmic-ray proton, nuclei, antiproton, electron and positron energy spectra within a "two-halo model" of diffusive transport.
Tomassetti, Nicola
core   +3 more sources

The generation of low-energy cosmic rays in molecular clouds

, 2005
It is argued that if cosmic rays penetrate into molecular clouds, the total energy they lose can exceed the energy from galactic supernovae shocks. It is shown that most likely galactic cosmic rays interacting with the surface layers of molecular clouds ...
A. M. Bykov, A. M. Bykov, A. M. Bykov, C. J. Cesarsky, D. C. Ellison, E. Falgarone, E. Falgarone, E. J. O’Donnell, E. Vazquez-Semadeni, F. J. Vrba, I. N. Toptygin, J. A. Simpson, J. Ballesteros-Paredes, J. Bally, J. Barsuhn, J. G. Vestuto, J. P. Phillips, L. O’C. Drury, M. A. Lee, M. H. Heyer, P. C. Myers, P. C. Myers, P. Padoan, R. Blandford, R. Schlickeiser, S. Boldyrev, S. D. Doty, T. Nakano, W. D. Watson, W.-T. Kim, Yu. A. Shchekinov   +30 more
core   +2 more sources

Radial intensity gradients of galactic cosmic rays in the heliosphere at solar maximum: 1D no-shock simulation [PDF]

Geofísica Internacional, 2009
We study the spatial distribution of galactic cosmic rays in the heliosphere at solar maximum of cycles 21, 22 and 23, using a one-dimensional no-shock model of the cosmic ray transport equation.
R. A. Caballero-Lopez, O. G. Morales-Olivares   +1 more
doaj  

TeV GAMMA RAYS: OBSERVATIONS VERSUS EXPECTATIONS & THEORY

Acta Polytechnica, 2013
The scope of this paper is to discuss two important questions relevant for TeV γ-ray astronomy; the pursuit to reveal the origin of cosmic rays in our galaxy, and the opacity of the universe in γ-rays.
Frank Krennrich
doaj   +1 more source