Magnetogenesis in a Collisionless Plasma: From Weibel Instability to Turbulent Dynamo

We report on a first-principles numerical and theoretical study of plasma dynamo in a fully kinetic framework. By applying an external mechanical force to an initially unmagnetized plasma, we develop a self-consistent treatment of the generation of “seed” magnetic fields, the formation of turbulence...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Muni Zhou [verfasserIn] Vladimir Zhdankin [verfasserIn] Matthew W. Kunz [verfasserIn] Nuno F. Loureiro [verfasserIn] Dmitri A. Uzdensky [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	Extragalactic magnetic fields Cosmic magnetic fields theory Plasma astrophysics Intracluster medium Intergalactic medium

Übergeordnetes Werk:	In: The Astrophysical Journal - IOP Publishing, 2022, 960(2023), 1, p 12
Übergeordnetes Werk:	volume:960 ; year:2023 ; number:1, p 12

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3847/1538-4357/ad0b0f

Katalog-ID:	DOAJ099057549

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callnumber-first	Q - Science
author	Muni Zhou
spellingShingle	Muni Zhou misc QB460-466 misc Extragalactic magnetic fields misc Cosmic magnetic fields theory misc Plasma astrophysics misc Intracluster medium misc Intergalactic medium misc Astrophysics Magnetogenesis in a Collisionless Plasma: From Weibel Instability to Turbulent Dynamo
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topic_title	QB460-466 Magnetogenesis in a Collisionless Plasma: From Weibel Instability to Turbulent Dynamo Extragalactic magnetic fields Cosmic magnetic fields theory Plasma astrophysics Intracluster medium Intergalactic medium
topic	misc QB460-466 misc Extragalactic magnetic fields misc Cosmic magnetic fields theory misc Plasma astrophysics misc Intracluster medium misc Intergalactic medium misc Astrophysics
topic_unstemmed	misc QB460-466 misc Extragalactic magnetic fields misc Cosmic magnetic fields theory misc Plasma astrophysics misc Intracluster medium misc Intergalactic medium misc Astrophysics
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title	Magnetogenesis in a Collisionless Plasma: From Weibel Instability to Turbulent Dynamo
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title_full	Magnetogenesis in a Collisionless Plasma: From Weibel Instability to Turbulent Dynamo
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author_browse	Muni Zhou Vladimir Zhdankin Matthew W. Kunz Nuno F. Loureiro Dmitri A. Uzdensky
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title_sort	magnetogenesis in a collisionless plasma: from weibel instability to turbulent dynamo
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title_auth	Magnetogenesis in a Collisionless Plasma: From Weibel Instability to Turbulent Dynamo
abstract	We report on a first-principles numerical and theoretical study of plasma dynamo in a fully kinetic framework. By applying an external mechanical force to an initially unmagnetized plasma, we develop a self-consistent treatment of the generation of “seed” magnetic fields, the formation of turbulence, and the inductive amplification of fields by the fluctuation dynamo. Driven large-scale motions in an unmagnetized, weakly collisional plasma are subject to strong phase mixing, which leads to the development of thermal pressure anisotropy. This anisotropy triggers the Weibel instability, which produces filamentary “seed” magnetic fields on plasma-kinetic scales. The plasma is thereby magnetized, enabling efficient stretching and folding of the fields by the plasma motions and the development of Larmor-scale kinetic instabilities such as the firehose and mirror. The scattering of particles off the associated microscale magnetic fluctuations provides an effective viscosity, regulating the field morphology and turbulence. During this process, the seed field is further amplified by the fluctuation dynamo until energy equipartition with the turbulent flow is reached. By demonstrating that equipartition magnetic fields can be generated from an initially unmagnetized plasma through large-scale turbulent flows, this work has important implications for the origin and amplification of magnetic fields in the intracluster and intergalactic mediums.
abstractGer	We report on a first-principles numerical and theoretical study of plasma dynamo in a fully kinetic framework. By applying an external mechanical force to an initially unmagnetized plasma, we develop a self-consistent treatment of the generation of “seed” magnetic fields, the formation of turbulence, and the inductive amplification of fields by the fluctuation dynamo. Driven large-scale motions in an unmagnetized, weakly collisional plasma are subject to strong phase mixing, which leads to the development of thermal pressure anisotropy. This anisotropy triggers the Weibel instability, which produces filamentary “seed” magnetic fields on plasma-kinetic scales. The plasma is thereby magnetized, enabling efficient stretching and folding of the fields by the plasma motions and the development of Larmor-scale kinetic instabilities such as the firehose and mirror. The scattering of particles off the associated microscale magnetic fluctuations provides an effective viscosity, regulating the field morphology and turbulence. During this process, the seed field is further amplified by the fluctuation dynamo until energy equipartition with the turbulent flow is reached. By demonstrating that equipartition magnetic fields can be generated from an initially unmagnetized plasma through large-scale turbulent flows, this work has important implications for the origin and amplification of magnetic fields in the intracluster and intergalactic mediums.
abstract_unstemmed	We report on a first-principles numerical and theoretical study of plasma dynamo in a fully kinetic framework. By applying an external mechanical force to an initially unmagnetized plasma, we develop a self-consistent treatment of the generation of “seed” magnetic fields, the formation of turbulence, and the inductive amplification of fields by the fluctuation dynamo. Driven large-scale motions in an unmagnetized, weakly collisional plasma are subject to strong phase mixing, which leads to the development of thermal pressure anisotropy. This anisotropy triggers the Weibel instability, which produces filamentary “seed” magnetic fields on plasma-kinetic scales. The plasma is thereby magnetized, enabling efficient stretching and folding of the fields by the plasma motions and the development of Larmor-scale kinetic instabilities such as the firehose and mirror. The scattering of particles off the associated microscale magnetic fluctuations provides an effective viscosity, regulating the field morphology and turbulence. During this process, the seed field is further amplified by the fluctuation dynamo until energy equipartition with the turbulent flow is reached. By demonstrating that equipartition magnetic fields can be generated from an initially unmagnetized plasma through large-scale turbulent flows, this work has important implications for the origin and amplification of magnetic fields in the intracluster and intergalactic mediums.
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title_short	Magnetogenesis in a Collisionless Plasma: From Weibel Instability to Turbulent Dynamo
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author2	Vladimir Zhdankin Matthew W. Kunz Nuno F. Loureiro Dmitri A. Uzdensky
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up_date	2024-07-03T20:46:38.271Z
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Magnetogenesis in a Collisionless Plasma: From Weibel Instability to Turbulent Dynamo

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