The extension of the concept of the cosmic-ray path-length distribution to nonrelativistic energies

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Models, Cosmic Rays, Propagation Modes, Green'S Functions, Interstellar Matter, Ionization, Particle Trajectories, Trajectory Analysis

Scientific paper

The concept of the cosmic-ray path-length distribution is examined. The corresponding cosmic-ray propagation calculational procedure has been justified theoretically at relativistic energies (Ginzburg and Syrovatskii, 1964) where the effects of ionization energy loss are negligible. The present paper extends the use of the path-length distribution concept in cosmic-ray propagation calculations to nonrelativistic energies. Sufficient constraints to effect this extension are presented. The solution of the cosmic-ray propagation equations in terms of a Green's function approach is also investigated and is used to provide a formulation of the path-length distribution at nonrelativistic as well as relativistic energies in terms of the cosmic-ray source distribution and the propagation characteristics of the interstellar medium. The leaky-box model of cosmic-ray propagation is also examined.

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