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Comparison of the telegraph and hyperdiffusion approximations in cosmic-ray transport
Abstract
The telegraph equation and its generalizations have been repeatedly considered in the models of diffusive cosmic-ray transport. Yet the telegraph model has well-known limitations, and analytical arguments suggest that a hyperdiffusion model should serve as a more accurate alternative to the telegraph model, especially on the timescale of a few scattering times. We present a detailed side-by-side comparison of an evolving particle density profile, predicted by the telegraph and hyperdiffusion models in the context of a simple but physically meaningful initial-value problem, compare the predictions with the solution based on the Fokker–Planck equation, and discuss the applicability of the telegraph and hyperdiffusion approximations to the description of strongly anisotropic particle distributions.
Type
Journal Article
Type of thesis
Series
Citation
Litvinenko, Y. E., & Noble, P. L. (2016). Comparison of the telegraph and hyperdiffusion approximations in cosmic-ray transport. Physics of Plasmas, 23(6). http://doi.org/10.1063/1.4953564
Date
2016
Publisher
American Institute of Physics (AIP)
Degree
Supervisors
Rights
This article is published in the Physics of Plasmas. © 2016 American Institute of Physics (AIP).