Scalings for the Alfvén-cyclotron instability: Linear dispersion theory and hybrid particle-in-cell simulations: Scalings of Alfven-Cyclotron Instability
Abstract
The Alfvén-cyclotron instability is driven by an ion temperature anisotropy such that T⊥/T|| >1 where ⊥ and || denote directions perpendicular and parallel to a uniform background magnetic field Bo, respectively. The computations presented here consider a model of a magnetized, homogeneous, collisionless plasma. Two representations of the proton velocity distribution are considered: a single bi-Maxwellian and a magnetospheric-like configuration of two components, a more dense, relatively cool, isotropic component and a less dense, relatively hot, bi-Maxwellian component which drives the instability. Only wave propagation parallel to Bo is considered. Here, using numerical solutions of the full kinetic linear dispersion equation, concise analytic expressions for the scaling of the dimensionless maximum instability growth rate and the corresponding dimensionless real frequency are derived as functions of three dimensionless variables: the hot proton temperature anisotropy, the relative hot proton density, and the hot proton β||. Furthermore, using one-dimensional hybrid particle-in-cell simulations of this same instability, a third relation for the scaling of the maximum amplitude of the dimensionless fluctuating magnetic field energy density is derived.
- Authors:
-
[1];
[3];
[3];
[4]
- Space Science Inst., Boulder CO (United States)
- New Mexico Consortium, Los Alamos, NM (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Auburn Univ., AL (United States). Dept. of Physics
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA)
- OSTI Identifier:
- 1505958
- Report Number(s):
- LA-UR-16-27692
Journal ID: ISSN 2169-9380
- Grant/Contract Number:
- 89233218CNA000001; NNH13AW83I; NNH14AX90I
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Space Physics
- Additional Journal Information:
- Journal Volume: 122; Journal Issue: 1; Journal ID: ISSN 2169-9380
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Heliospheric and Magnetospheric Physics; Alfven-cyclotron instability
Citation Formats
Gary, S. Peter, Fu, Xiangrong, Cowee, Misa M., Winske, Dan, and Liu, Kaijun. Scalings for the Alfvén-cyclotron instability: Linear dispersion theory and hybrid particle-in-cell simulations: Scalings of Alfven-Cyclotron Instability. United States: N. p., 2016.
Web. doi:10.1002/2016JA023425.
Gary, S. Peter, Fu, Xiangrong, Cowee, Misa M., Winske, Dan, & Liu, Kaijun. Scalings for the Alfvén-cyclotron instability: Linear dispersion theory and hybrid particle-in-cell simulations: Scalings of Alfven-Cyclotron Instability. United States. https://doi.org/10.1002/2016JA023425
Gary, S. Peter, Fu, Xiangrong, Cowee, Misa M., Winske, Dan, and Liu, Kaijun. Mon .
"Scalings for the Alfvén-cyclotron instability: Linear dispersion theory and hybrid particle-in-cell simulations: Scalings of Alfven-Cyclotron Instability". United States. https://doi.org/10.1002/2016JA023425. https://www.osti.gov/servlets/purl/1505958.
@article{osti_1505958,
title = {Scalings for the Alfvén-cyclotron instability: Linear dispersion theory and hybrid particle-in-cell simulations: Scalings of Alfven-Cyclotron Instability},
author = {Gary, S. Peter and Fu, Xiangrong and Cowee, Misa M. and Winske, Dan and Liu, Kaijun},
abstractNote = {The Alfvén-cyclotron instability is driven by an ion temperature anisotropy such that T⊥/T|| >1 where ⊥ and || denote directions perpendicular and parallel to a uniform background magnetic field Bo, respectively. The computations presented here consider a model of a magnetized, homogeneous, collisionless plasma. Two representations of the proton velocity distribution are considered: a single bi-Maxwellian and a magnetospheric-like configuration of two components, a more dense, relatively cool, isotropic component and a less dense, relatively hot, bi-Maxwellian component which drives the instability. Only wave propagation parallel to Bo is considered. Here, using numerical solutions of the full kinetic linear dispersion equation, concise analytic expressions for the scaling of the dimensionless maximum instability growth rate and the corresponding dimensionless real frequency are derived as functions of three dimensionless variables: the hot proton temperature anisotropy, the relative hot proton density, and the hot proton β||. Furthermore, using one-dimensional hybrid particle-in-cell simulations of this same instability, a third relation for the scaling of the maximum amplitude of the dimensionless fluctuating magnetic field energy density is derived.},
doi = {10.1002/2016JA023425},
journal = {Journal of Geophysical Research. Space Physics},
number = 1,
volume = 122,
place = {United States},
year = {Mon Dec 12 00:00:00 EST 2016},
month = {Mon Dec 12 00:00:00 EST 2016}
}
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Works referencing / citing this record:
Polarization properties of low frequency electromagnetic cyclotron waves associated with magnetic clouds
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