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

Research output: Contribution to journalArticleScientificpeer-review

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.

Original languageEnglish
JournalAnnales Geophysicae
Volume39
Issue number1
Pages (from-to)85-103
Number of pages19
ISSN0992-7689
DOIs
Publication statusPublished - 28 Jan 2021
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 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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