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

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Battarbee , M , Brito , T , Alho , M , Pfau-Kempf , Y , Grandin , M , Ganse , U , Papadakis , K , Johlander , A , Turc , L , Dubart , M & Palmroth , M 2021 , ' Vlasov simulation of electrons in the context of hybrid global models: an eVlasiator approach ' , Annales Geophysicae , vol. 39 , no. 1 , pp. 85-103 . https://doi.org/10.5194/angeo-39-85-2021

Title: Vlasov simulation of electrons in the context of hybrid global models: an eVlasiator approach
Author: Battarbee, Markus; Brito, Thiago; Alho, Markku; Pfau-Kempf, Yann; Grandin, Maxime; Ganse, Urs; Papadakis, Konstantinos; Johlander, Andreas; Turc, Lucile; Dubart, Maxime; Palmroth, Minna
Contributor: University of Helsinki, Particle Physics and Astrophysics
University of Helsinki, Department of Physics
University of Helsinki, Space Physics Research Group
University of Helsinki, Particle Physics and Astrophysics
University of Helsinki, Particle Physics and Astrophysics
University of Helsinki, Department of Physics
University of Helsinki, Space Physics Research Group
University of Helsinki, Space Physics Research Group
University of Helsinki, Particle Physics and Astrophysics
University of Helsinki, Space Physics Research Group
University of Helsinki, Department of Physics
Date: 2021-01-28
Language: eng
Number of pages: 19
Belongs to series: Annales Geophysicae
ISSN: 0992-7689
URI: http://hdl.handle.net/10138/328182
Abstract: 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 magneto-hydrodynamics 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.
Subject: DIFFUSION REGION
DISTRIBUTIONS
ELECTROSTATIC-WAVES
INTERPLANETARY MAGNETIC-FIELD
MAGNETOHYDRODYNAMICS
MAGNETOTAIL
PLASMA
RECONNECTION
TEMPERATURE RATIO
X LINE MOTION
115 Astronomy, Space science
114 Physical sciences
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