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Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
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Simulations of cosmic ray propagation.

Michał Hanasz1, Andrew W Strong2, Philipp Girichidis3

  • 1Institute of Astronomy, Nicolaus Copernicus University, ul. Grudziadzka 5, 87-100 Toruń, Poland.

Living Reviews in Computational Astrophysics
|November 1, 2021
PubMed
Summary

This review covers numerical methods for simulating cosmic ray (CR) propagation. It details algorithms for phenomenological and self-consistent models, crucial for understanding galactic evolution and CR interactions.

Keywords:
Astroparticle physicsMagnetohydrodynamicsPlasma

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Area of Science:

  • Astrophysics
  • Computational Physics

Background:

  • Cosmic rays (CRs) are high-energy particles propagating through astrophysical environments.
  • Understanding CR propagation is key to galactic evolution and high-energy astrophysics.

Purpose of the Study:

  • To review numerical methods for simulating CR propagation on galactic scales.
  • To present algorithms for phenomenological and self-consistent CR propagation models.

Main Methods:

  • Numerical solutions of the Fokker-Planck equation for kinetic CR description.
  • Discretization and numerical solution of the CR transport equation coupled with MHD equations.
  • Two-fluid approach and spectrally resolved particle evolution in physical and momentum space.

Main Results:

  • Development of algorithms for phenomenological models with stationary interstellar medium.
  • Development of algorithms for self-consistent models with dynamical coupling of CRs to thermal plasma.
  • Incorporation of advection, diffusion, spallation, secondary production, and radiation mechanisms.

Conclusions:

  • Numerical models are essential for interpreting CR data from various instruments.
  • These models aid in understanding astrophysical processes like galactic winds and magnetic field amplification.
  • Simulations provide insights into interstellar medium instabilities and galactic evolution.