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Title: Explaining TeV cosmic-ray anisotropies with non-diffusive cosmic-ray propagation

Abstract

Constraining the behavior of cosmic ray data observed at Earth requires a precise understanding of how the cosmic rays propagate in the interstellar medium. The interstellar medium is not homogeneous; although turbulent magnetic fields dominate over large scales, small coherent regions of magnetic field exist on scales relevant to particle propagation in the nearby Galaxy. Guided propagation through a coherent field is significantly different from random particle diffusion and could be the explanation of spatial anisotropies in the observed cosmic rays. We present a Monte Carlo code to propagate cosmic particle through realistic magnetic field structures. We discuss the details of the model as well as some preliminary studies which indicate that coherent magnetic structures are important effects in local cosmic-ray propagation, increasing the flux of cosmic rays by over two orders of magnitude at anisotropic locations on the sky. Furthermore, the features induced by coherent magnetic structure could be the cause of the observed TeV cosmic-ray anisotropy.

Authors:
 [1]; ORCiD logo [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1334145
Report Number(s):
LA-UR-15-27838
Journal ID: ISSN 1538-4357
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 822; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; astroparticle physics; cosmic rays; ISM: kinematics and dynamics; magnetic fields; turbulence

Citation Formats

Harding, James Patrick, Fryer, Chris Lee, and Mendel, Susan Marie. Explaining TeV cosmic-ray anisotropies with non-diffusive cosmic-ray propagation. United States: N. p., 2016. Web. doi:10.3847/0004-637X/822/2/102.
Harding, James Patrick, Fryer, Chris Lee, & Mendel, Susan Marie. Explaining TeV cosmic-ray anisotropies with non-diffusive cosmic-ray propagation. United States. doi:10.3847/0004-637X/822/2/102.
Harding, James Patrick, Fryer, Chris Lee, and Mendel, Susan Marie. Wed . "Explaining TeV cosmic-ray anisotropies with non-diffusive cosmic-ray propagation". United States. doi:10.3847/0004-637X/822/2/102. https://www.osti.gov/servlets/purl/1334145.
@article{osti_1334145,
title = {Explaining TeV cosmic-ray anisotropies with non-diffusive cosmic-ray propagation},
author = {Harding, James Patrick and Fryer, Chris Lee and Mendel, Susan Marie},
abstractNote = {Constraining the behavior of cosmic ray data observed at Earth requires a precise understanding of how the cosmic rays propagate in the interstellar medium. The interstellar medium is not homogeneous; although turbulent magnetic fields dominate over large scales, small coherent regions of magnetic field exist on scales relevant to particle propagation in the nearby Galaxy. Guided propagation through a coherent field is significantly different from random particle diffusion and could be the explanation of spatial anisotropies in the observed cosmic rays. We present a Monte Carlo code to propagate cosmic particle through realistic magnetic field structures. We discuss the details of the model as well as some preliminary studies which indicate that coherent magnetic structures are important effects in local cosmic-ray propagation, increasing the flux of cosmic rays by over two orders of magnitude at anisotropic locations on the sky. Furthermore, the features induced by coherent magnetic structure could be the cause of the observed TeV cosmic-ray anisotropy.},
doi = {10.3847/0004-637X/822/2/102},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 822,
place = {United States},
year = {Wed May 11 00:00:00 EDT 2016},
month = {Wed May 11 00:00:00 EDT 2016}
}

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Cited by: 2works
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