Cosmic ray transport in mixed magnetic fields and their role on the observed anisotropies

Margot Fitz Axen; Julia Speicher; Aimee Hungerford; Chris L. Fryer

doi:10.1093/mnras/staa3500

Cosmic ray transport in mixed magnetic fields and their role on the observed anisotropies

Margot Fitz Axen, Julia Speicher, Aimee Hungerford, Chris L. Fryer

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

There is a growing set of observational data demonstrating that cosmic rays exhibit small-scale anisotropies (5°-30°) with amplitude deviations lying between 0.01-0.1 per cent that of the average cosmic ray flux. A broad range of models have been proposed to explain these anisotropies ranging from finite-scale magnetic field structures to dark matter annihilation. The standard diffusion transport methods used in cosmic ray propagation do not capture the transport physics in a medium with finite-scale or coherent magnetic field structures. Here, we present a Monte Carlo transport method, applying it to a series of finite-scale magnetic field structures to determine the requirements of such fields in explaining the observed cosmic ray, small-scale anisotropies.

Original language	English
Pages (from-to)	3497-3510
Number of pages	14
Journal	Monthly Notices of the Royal Astronomical Society
Volume	500
Issue number	3
DOIs	https://doi.org/10.1093/mnras/staa3500
State	Published - Jan 1 2021
Externally published	Yes

Funding

This work was supported by the U.S. Department of Energy through the Los Alamos National Laboratory. Los Alamos National Laboratory is operated by Triad National Security, LLC, for the National Nuclear Security Administration of U.S. Department of Energy (contract no. 89233218CNA000001) This research was supported in part by the National Science Foundation under grant no. NSF PHY-1748958 and by NASA Astrophysics Theory Program grant 80NSSC20K0507.

Funders	Funder number
National Science Foundation	PHY-1748958
U.S. Department of Energy
Directorate for Mathematical and Physical Sciences	1748958
National Aeronautics and Space Administration	80NSSC20K0507
National Nuclear Security Administration	89233218CNA000001
Los Alamos National Laboratory

Keywords

Astroparticle physics
Cosmic rays
ISM: Magnetic fields

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10.1093/mnras/staa3500

Cite this

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Cosmic ray transport in mixed magnetic fields and their role on the observed anisotropies

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Keywords

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