On a nonlinear state of the electromagnetic ion/ion cyclotron instability

We have investigated the nonlinear properties of the electromagnetic ion/ion cyclotron instability (EMIIC) by means of hybrid simulations (macroparticle ions, massless electron fluid). The instability is driven by the relative (super-Alfvénic) streaming of two field-aligned ion beams in a low beta p...

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Main Author: M. Scholer
Format: Article
Language:English
Published: Copernicus Publications 2000-01-01
Series:Nonlinear Processes in Geophysics
Online Access:http://www.nonlin-processes-geophys.net/7/173/2000/npg-7-173-2000.pdf
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author M. Scholer
author_facet M. Scholer
author_sort M. Scholer
collection DOAJ
description We have investigated the nonlinear properties of the electromagnetic ion/ion cyclotron instability (EMIIC) by means of hybrid simulations (macroparticle ions, massless electron fluid). The instability is driven by the relative (super-Alfvénic) streaming of two field-aligned ion beams in a low beta plasma (ion thermal pressure to magnetic field pressure) and may be of importance in the plasma sheet boundary layer. As shown in previously reported simulations the waves propagate obliquely to the magnetic field and heat the ions in the perpendicular direction as the relative beam velocity decreases. By running the simulation to large times it can be shown that the large temperature anisotropy leads to the ion cyclotron instability (IC) with parallel propagating Alfvén ion cyclotron waves. This is confirmed by numerically solving the electromagnetic dispersion relation. An application of this property to the plasma sheet boundary layer is discussed.
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spelling doaj.art-5e50624686d14615a9438718a48e37d12022-12-21T18:26:11ZengCopernicus PublicationsNonlinear Processes in Geophysics1023-58091607-79462000-01-0173/4173177On a nonlinear state of the electromagnetic ion/ion cyclotron instabilityM. ScholerWe have investigated the nonlinear properties of the electromagnetic ion/ion cyclotron instability (EMIIC) by means of hybrid simulations (macroparticle ions, massless electron fluid). The instability is driven by the relative (super-Alfvénic) streaming of two field-aligned ion beams in a low beta plasma (ion thermal pressure to magnetic field pressure) and may be of importance in the plasma sheet boundary layer. As shown in previously reported simulations the waves propagate obliquely to the magnetic field and heat the ions in the perpendicular direction as the relative beam velocity decreases. By running the simulation to large times it can be shown that the large temperature anisotropy leads to the ion cyclotron instability (IC) with parallel propagating Alfvén ion cyclotron waves. This is confirmed by numerically solving the electromagnetic dispersion relation. An application of this property to the plasma sheet boundary layer is discussed.http://www.nonlin-processes-geophys.net/7/173/2000/npg-7-173-2000.pdf
spellingShingle M. Scholer
On a nonlinear state of the electromagnetic ion/ion cyclotron instability
Nonlinear Processes in Geophysics
title On a nonlinear state of the electromagnetic ion/ion cyclotron instability
title_full On a nonlinear state of the electromagnetic ion/ion cyclotron instability
title_fullStr On a nonlinear state of the electromagnetic ion/ion cyclotron instability
title_full_unstemmed On a nonlinear state of the electromagnetic ion/ion cyclotron instability
title_short On a nonlinear state of the electromagnetic ion/ion cyclotron instability
title_sort on a nonlinear state of the electromagnetic ion ion cyclotron instability
url http://www.nonlin-processes-geophys.net/7/173/2000/npg-7-173-2000.pdf
work_keys_str_mv AT mscholer onanonlinearstateoftheelectromagneticionioncyclotroninstability