Galactic Cosmic-ray Transport in the Global Heliosphere: A Four-Dimensional Stochastic Model

Details Galactic Cosmic-ray Transport in the Global Heliosphere: A Four-Dimensional Stochastic Model Galactic Cosmic-ray Transport in the Global Heliosphere: A Four-Dimensional Stochastic Model

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..406....3f&link_type=abstract

Numerical Modeling of Space Plasma Flows: ASTRONUM-2008 ASP Conference Series, Vol. 406, proceedings of the conference held 8-13

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We study galactic cosmic-ray transport in the outer heliosphere and heliosheath using a newly developed transport model based on stochastic integration of the phase-space trajectories of Parker's equation. The model employs backward integration of the diffusion-convection transport equation using Ito calculus and is four-dimensional in space+momentum. We apply the model to the problem of galactic proton transport in the heliosphere during a negative solar minimum. Model results are compared with the Voyager measurements of galactic proton radial gradients and spectra in the heliosheath. We show that the heliosheath is not as efficient in diverting cosmic rays during solar minima as predicted by earlier two-dimensional models.

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