Mirror Acceleration of Cosmic Rays in a High-β Medium

In a weakly compressible high- β medium, pitch-angle scattering and the associated scattering acceleration of cosmic rays (CRs) by anisotropic Alfvén and slow modes of magnetohydrodynamic (MHD) turbulence is inefficient. To tap the energy from magnetic compressions for efficient particle acceleratio...
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Autor*in:	Alex Lazarian [verfasserIn] Siyao Xu [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	Magnetohydrodynamics Cosmic rays Intracluster medium

Übergeordnetes Werk:	In: The Astrophysical Journal - IOP Publishing, 2022, 956(2023), 1, p 63
Übergeordnetes Werk:	volume:956 ; year:2023 ; number:1, p 63

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3847/1538-4357/acea5c

Katalog-ID:	DOAJ095213848

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520			\|a In a weakly compressible high- β medium, pitch-angle scattering and the associated scattering acceleration of cosmic rays (CRs) by anisotropic Alfvén and slow modes of magnetohydrodynamic (MHD) turbulence is inefficient. To tap the energy from magnetic compressions for efficient particle acceleration, a diffusion mechanism that can effectively confine particles in space without causing their trapping or pitch-angle isotropization is needed. We find that the mirror diffusion in MHD turbulence recently identified in Lazarian & Xu satisfies all the above conditions and serves as a promising diffusion mechanism for efficient acceleration of CRs via their stochastic nonresonant interactions with magnetic compressions/expansions. The resulting mirror acceleration is dominated by the slow-mode eddies with their lifetime comparable to the mirror diffusion time of CRs. Consequently, we find that the acceleration time of mirror acceleration is independent of the spatial diffusion coefficient of CRs. The mirror acceleration brings new life for the particle acceleration in a weakly compressible/incompressible medium and has important implications for studying CR reacceleration in the high- β intracluster medium.
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language	English
source	In The Astrophysical Journal 956(2023), 1, p 63 volume:956 year:2023 number:1, p 63
sourceStr	In The Astrophysical Journal 956(2023), 1, p 63 volume:956 year:2023 number:1, p 63
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topic_facet	Magnetohydrodynamics Cosmic rays Intracluster medium Astrophysics
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container_title	The Astrophysical Journal
authorswithroles_txt_mv	Alex Lazarian @@aut@@ Siyao Xu @@aut@@
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author	Alex Lazarian
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topic_title	QB460-466 Mirror Acceleration of Cosmic Rays in a High-β Medium Magnetohydrodynamics Cosmic rays Intracluster medium
topic	misc QB460-466 misc Magnetohydrodynamics misc Cosmic rays misc Intracluster medium misc Astrophysics
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title	Mirror Acceleration of Cosmic Rays in a High-β Medium
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title_sort	mirror acceleration of cosmic rays in a high-β medium
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title_auth	Mirror Acceleration of Cosmic Rays in a High-β Medium
abstract	In a weakly compressible high- β medium, pitch-angle scattering and the associated scattering acceleration of cosmic rays (CRs) by anisotropic Alfvén and slow modes of magnetohydrodynamic (MHD) turbulence is inefficient. To tap the energy from magnetic compressions for efficient particle acceleration, a diffusion mechanism that can effectively confine particles in space without causing their trapping or pitch-angle isotropization is needed. We find that the mirror diffusion in MHD turbulence recently identified in Lazarian & Xu satisfies all the above conditions and serves as a promising diffusion mechanism for efficient acceleration of CRs via their stochastic nonresonant interactions with magnetic compressions/expansions. The resulting mirror acceleration is dominated by the slow-mode eddies with their lifetime comparable to the mirror diffusion time of CRs. Consequently, we find that the acceleration time of mirror acceleration is independent of the spatial diffusion coefficient of CRs. The mirror acceleration brings new life for the particle acceleration in a weakly compressible/incompressible medium and has important implications for studying CR reacceleration in the high- β intracluster medium.
abstractGer	In a weakly compressible high- β medium, pitch-angle scattering and the associated scattering acceleration of cosmic rays (CRs) by anisotropic Alfvén and slow modes of magnetohydrodynamic (MHD) turbulence is inefficient. To tap the energy from magnetic compressions for efficient particle acceleration, a diffusion mechanism that can effectively confine particles in space without causing their trapping or pitch-angle isotropization is needed. We find that the mirror diffusion in MHD turbulence recently identified in Lazarian & Xu satisfies all the above conditions and serves as a promising diffusion mechanism for efficient acceleration of CRs via their stochastic nonresonant interactions with magnetic compressions/expansions. The resulting mirror acceleration is dominated by the slow-mode eddies with their lifetime comparable to the mirror diffusion time of CRs. Consequently, we find that the acceleration time of mirror acceleration is independent of the spatial diffusion coefficient of CRs. The mirror acceleration brings new life for the particle acceleration in a weakly compressible/incompressible medium and has important implications for studying CR reacceleration in the high- β intracluster medium.
abstract_unstemmed	In a weakly compressible high- β medium, pitch-angle scattering and the associated scattering acceleration of cosmic rays (CRs) by anisotropic Alfvén and slow modes of magnetohydrodynamic (MHD) turbulence is inefficient. To tap the energy from magnetic compressions for efficient particle acceleration, a diffusion mechanism that can effectively confine particles in space without causing their trapping or pitch-angle isotropization is needed. We find that the mirror diffusion in MHD turbulence recently identified in Lazarian & Xu satisfies all the above conditions and serves as a promising diffusion mechanism for efficient acceleration of CRs via their stochastic nonresonant interactions with magnetic compressions/expansions. The resulting mirror acceleration is dominated by the slow-mode eddies with their lifetime comparable to the mirror diffusion time of CRs. Consequently, we find that the acceleration time of mirror acceleration is independent of the spatial diffusion coefficient of CRs. The mirror acceleration brings new life for the particle acceleration in a weakly compressible/incompressible medium and has important implications for studying CR reacceleration in the high- β intracluster medium.
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title_short	Mirror Acceleration of Cosmic Rays in a High-β Medium
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