Vlasov simulation of electrons in the context of hybrid global models: an eVlasiator approach

<p>Modern investigations of dynamical space plasma systems such as magnetically complicated topologies within the Earth's magnetosphere make great use of supercomputer models as well as spacecraft observations. Space plasma simulations can be used to investigate energy transfer, accelerat...

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Main Authors:	M. Battarbee, T. Brito, M. Alho, Y. Pfau-Kempf, M. Grandin, U. Ganse, K. Papadakis, A. Johlander, L. Turc, M. Dubart, M. Palmroth
Format:	Article
Language:	English
Published:	Copernicus Publications 2021-01-01
Series:	Annales Geophysicae
Online Access:	https://angeo.copernicus.org/articles/39/85/2021/angeo-39-85-2021.pdf

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spelling	doaj-3d8616682f5247f988cb48de8b3d751f2021-01-28T16:31:11ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762021-01-01398510310.5194/angeo-39-85-2021Vlasov simulation of electrons in the context of hybrid global models: an eVlasiator approachM. Battarbee0T. Brito1M. Alho2Y. Pfau-Kempf3M. Grandin4U. Ganse5K. Papadakis6A. Johlander7L. Turc8M. Dubart9M. Palmroth10M. Palmroth11Space Physics Research group, Department of Physics, University of Helsinki, Helsinki, FinlandSpace Physics Research group, Department of Physics, University of Helsinki, Helsinki, FinlandSpace Physics Research group, Department of Physics, University of Helsinki, Helsinki, FinlandSpace Physics Research group, Department of Physics, University of Helsinki, Helsinki, FinlandSpace Physics Research group, Department of Physics, University of Helsinki, Helsinki, FinlandSpace Physics Research group, Department of Physics, University of Helsinki, Helsinki, FinlandSpace Physics Research group, Department of Physics, University of Helsinki, Helsinki, FinlandSpace Physics Research group, Department of Physics, University of Helsinki, Helsinki, FinlandSpace Physics Research group, Department of Physics, University of Helsinki, Helsinki, FinlandSpace Physics Research group, Department of Physics, University of Helsinki, Helsinki, FinlandSpace Physics Research group, Department of Physics, University of Helsinki, Helsinki, FinlandFinnish Meteorological Institute, Helsinki, Finland<p>Modern investigations of dynamical space plasma systems such as magnetically complicated topologies within the Earth's magnetosphere make great use of supercomputer models as well as spacecraft observations. Space plasma simulations can be used to investigate energy transfer, acceleration, and plasma flows on both global and local scales. Simulation of global magnetospheric dynamics requires spatial and temporal scales currently achievable through magnetohydrodynamics or hybrid-kinetic simulations, which approximate electron dynamics as a charge-neutralizing fluid. We introduce a novel method for Vlasov-simulating electrons in the context of a hybrid-kinetic framework in order to examine the energization processes of magnetospheric electrons. Our extension of the Vlasiator hybrid-Vlasov code utilizes the global simulation dynamics of the hybrid method whilst modelling snapshots of electron dynamics on global spatial scales and temporal scales suitable for electron physics. Our eVlasiator model is shown to be stable both for single-cell and small-scale domains, and the solver successfully models Langmuir waves and Bernstein modes. We simulate a small test-case section of the near-Earth magnetotail plasma sheet region, reproducing a number of electron distribution function features found in spacecraft measurements.</p>https://angeo.copernicus.org/articles/39/85/2021/angeo-39-85-2021.pdf
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	M. Battarbee T. Brito M. Alho Y. Pfau-Kempf M. Grandin U. Ganse K. Papadakis A. Johlander L. Turc M. Dubart M. Palmroth M. Palmroth
spellingShingle	M. Battarbee T. Brito M. Alho Y. Pfau-Kempf M. Grandin U. Ganse K. Papadakis A. Johlander L. Turc M. Dubart M. Palmroth M. Palmroth Vlasov simulation of electrons in the context of hybrid global models: an eVlasiator approach Annales Geophysicae
author_facet	M. Battarbee T. Brito M. Alho Y. Pfau-Kempf M. Grandin U. Ganse K. Papadakis A. Johlander L. Turc M. Dubart M. Palmroth M. Palmroth
author_sort	M. Battarbee
title	Vlasov simulation of electrons in the context of hybrid global models: an eVlasiator approach
title_short	Vlasov simulation of electrons in the context of hybrid global models: an eVlasiator approach
title_full	Vlasov simulation of electrons in the context of hybrid global models: an eVlasiator approach
title_fullStr	Vlasov simulation of electrons in the context of hybrid global models: an eVlasiator approach
title_full_unstemmed	Vlasov simulation of electrons in the context of hybrid global models: an eVlasiator approach
title_sort	vlasov simulation of electrons in the context of hybrid global models: an evlasiator approach
publisher	Copernicus Publications
series	Annales Geophysicae
issn	0992-7689 1432-0576
publishDate	2021-01-01
description	<p>Modern investigations of dynamical space plasma systems such as magnetically complicated topologies within the Earth's magnetosphere make great use of supercomputer models as well as spacecraft observations. Space plasma simulations can be used to investigate energy transfer, acceleration, and plasma flows on both global and local scales. Simulation of global magnetospheric dynamics requires spatial and temporal scales currently achievable through magnetohydrodynamics or hybrid-kinetic simulations, which approximate electron dynamics as a charge-neutralizing fluid. We introduce a novel method for Vlasov-simulating electrons in the context of a hybrid-kinetic framework in order to examine the energization processes of magnetospheric electrons. Our extension of the Vlasiator hybrid-Vlasov code utilizes the global simulation dynamics of the hybrid method whilst modelling snapshots of electron dynamics on global spatial scales and temporal scales suitable for electron physics. Our eVlasiator model is shown to be stable both for single-cell and small-scale domains, and the solver successfully models Langmuir waves and Bernstein modes. We simulate a small test-case section of the near-Earth magnetotail plasma sheet region, reproducing a number of electron distribution function features found in spacecraft measurements.</p>
url	https://angeo.copernicus.org/articles/39/85/2021/angeo-39-85-2021.pdf
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Vlasov simulation of electrons in the context of hybrid global models: an eVlasiator approach

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