Results 71 to 80 of about 3,608,924 (307)
SOLAR MODULATION OF GALACTIC COSMIC RAYS
, 2016 Beginning with the equations of the convection-diffusion model including energy losses, it is shown that the streaming of galactic cosmic rays in the solar-wind cavity can be neglected above a few hundred MeV per nucleon.
L. J. Gleeson, W. I. Axeord
semanticscholar +1 more source
Diffuse Emission of Galactic High-energy Neutrinos from a Global Fit of Cosmic Rays
The Astrophysical Journal, 2023 In the standard picture of Galactic cosmic rays, a diffuse flux of high-energy gamma rays and neutrinos is produced from inelastic collisions of cosmic-ray nuclei with the interstellar gas.
Georg Schwefer +2 more
doaj +1 more source
The Interaction of Cosmic Rays with Diffuse Clouds [PDF]
, 2011 We study the change in cosmic-ray pressure, the change in cosmic-ray density, and the level of cosmic-ray induced heating via Alfven-wave damping when cosmic rays move from a hot ionized plasma to a cool cloud embedded in that plasma. The general analysis method outlined here can apply to diffuse clouds in either the ionized interstellar medium or in ...
arxiv +1 more source
Stellar versus Galactic: The intensity of energetic particles at the evolving Earth and young exoplanets [PDF]
arXiv, 2021 Energetic particles may have been important for the origin of life on Earth by driving the formation of prebiotic molecules. We calculate the intensity of energetic particles, in the form of stellar and Galactic cosmic rays, that reach Earth at the time when life is thought to have begun ($\sim$3.8Gyr ago), using a combined 1.5D stellar wind model and ...
arxiv
Lithium-6 and Gamma Rays: Complementary Constraints on Cosmic-Ray History [PDF]
Astrophys.J. 623 (2005) 877-888, 2004 The rare isotope 6Li is made only by cosmic rays, dominantly in alpha+alpha fusion reactions with ISM helium. Consequently, this nuclide provides a unique diagnostic of the history of cosmic rays in our Galaxy. The same hadronic cosmic-ray interactions also produce high-energy gamma rays (mostly via neutral pion production).
arxiv +1 more source
The Dipole Anisotropy of Galactic Cosmic Rays [PDF]
, 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 origin of cosmic rays and TeV gamma-ray astronomy
EPJ Web of Conferences, 2013 Cosmic rays are accelerated to high energies in Galactic and extragalactic objects like Supernova remnants (SNR) and active galactic nuclei (AGN). How these accelerators work and how efficient they accelerate different types of particles to energies of ...
Maier Gernot
doaj +1 more source
Energy Budget in the High Energy Universe, 2007 Several kinds of measurements are combined in an attempt to obtain a consistent estimate of the spectrum and composition of the primary cosmic radiation through the knee region. Assuming that the knee is a signal of the high-energy end of a galactic cosmic-ray population, I discuss possible signatures of a transition to an extra-galactic population and
openaire +3 more sources
A predictive analytic model for the solar modulation of cosmic rays [PDF]
, 2015 An important factor limiting our ability to understand the production and propagation of cosmic rays pertains to the effects of heliospheric forces, commonly known as solar modulation.
I. Cholis, D. Hooper, T. Linden
semanticscholar +1 more source
Pilot study of ultra-high energy Cosmic rays through their Space – Atmospheric interactions – COSAT
EPJ Web of Conferences, 2015 One hundred years after the discovery of cosmic rays, the study of charged ultra-high energy cosmic rays remains a vital activity in fundamental physics.
Isar Paula Gina, Nicolae Doina
doaj +1 more source