Estimates of galactic cosmic ray spectra at low energies

Details Estimates of galactic cosmic ray spectra at low energies Estimates of galactic cosmic ray spectra at low energies

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149....7i&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 1, Aug. 1985, p. 7-10.

Astronomy and Astrophysics

Astrophysics

79

Astronomical Models, Energy Spectra, Galactic Cosmic Rays, Interstellar Matter, Particle Acceleration, Alpha Particles, Electron Energy, Energy Dissipation, Heavy Nuclei, Proton Energy, Radiation Pressure, Shock Waves

Scientific paper

A simple leaky-box model including shock acceleration, energy losses, and propagation loss is employed to calculate the energy spectra of cosmic ray protons, alpha particles, medium (C) and heavy (Fe) nuclei, and electrons between a few MeV/nucleon and 100 GeV/nucleon. On the basis of these theoretical results, the energy densities and pressures of the cosmic ray particle species are computed. One result of relevance to cosmic ray interaction with interstellar clouds is that the energy spectrum of protons has been found to be very flat for the energy range between 1 MeV and 100 MeV. This is in agreement with the 21-cm line observations of the optical thickness of H I in molecular clouds. Another consequence of the low energy proton and electron spectra so estimated is simply that the total cosmic ray pressure should be on the order of 0.4 eV per cu cm which implies that the low energy cosmic ray particles do not contribute significantly to the pressure balance at the boundary of the heliosphere.

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