Numerical modeling of time-dependent cosmic-ray advection and diffusion in spherically symmetric wind bubbles shows escaping spectra harder than E^{-2} during the wind-driven phase, with low-energy suppression depending on the turbulence model.
Kissmann,PICARD: A novel code for the Galactic Cosmic Ray propagation problem, Astroparticle Physics55(2014) 37 [1401.4035]
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abstract
In this manuscript we present a new approach for the numerical solution of the Galactic Cosmic Ray propagation problem. We introduce a method using advanced contemporary numerical algorithms while retaining the general complexity of other established codes. In this paper we present the underlying numerical scheme in conjunction with tests showing the correctness of the scheme. Finally we show the solution of a first example propagation problem using the new code to show its applicability to Galactic Cosmic Ray propagation.
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astro-ph.HE 2years
2026 2representative citing papers
SAETASS solves the time-dependent astroparticle transport equation in spherical symmetry using a conservative finite-volume, operator-splitting framework, validated against analytical solutions and applied to cosmic-ray proton transport in a stellar-wind bubble.
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Time-dependent cosmic-ray escape from wind bubbles: hard spectra formation
Numerical modeling of time-dependent cosmic-ray advection and diffusion in spherically symmetric wind bubbles shows escaping spectra harder than E^{-2} during the wind-driven phase, with low-energy suppression depending on the turbulence model.
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SAETASS: Solver for Astroparticle Equation of Transport Analysis in Spherical Symmetry
SAETASS solves the time-dependent astroparticle transport equation in spherical symmetry using a conservative finite-volume, operator-splitting framework, validated against analytical solutions and applied to cosmic-ray proton transport in a stellar-wind bubble.