### Abstract

Language | English |
---|---|

Article number | 062109 |

Number of pages | 9 |

Journal | Physics of Plasmas |

Volume | 22 |

Issue number | 6 |

DOIs | |

Publication status | Published - 15 Jun 2015 |

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### Keywords

- electromagnetic electron-cyclotron instability
- bi-Kappa distributed plasma
- numerical simulations

### Cite this

*Physics of Plasmas*,

*22*(6), [062109 ]. https://doi.org/10.1063/1.4922479

}

*Physics of Plasmas*, vol. 22, no. 6, 062109 . https://doi.org/10.1063/1.4922479

**Nonlinear evolution of the electromagnetic electron-cyclotron instability in bi-Kappa distributed plasma.** / Eliasson, B.; Lazar, M.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Nonlinear evolution of the electromagnetic electron-cyclotron instability in bi-Kappa distributed plasma

AU - Eliasson, B.

AU - Lazar, M.

PY - 2015/6/15

Y1 - 2015/6/15

N2 - This paper presents a numerical study of the linear and nonlinear evolution of the electromagnetic electron-cyclotron (EMEC) instability in a bi-Kappa distributed plasma. Distributions with high energy tails described by the Kappa power-laws are often observed in collision-less plasmas (e.g., solar wind, accelerators), where wave-particle interactions control the plasma thermodynamics and keep the particle distributions out of Maxwellian equilibrium. Under certain conditions, the anisotropic bi-Kappa distribution gives rise to plasma instabilities creating low-frequency EMEC waves in the whistler branch. The instability saturates nonlinearly by reducing the temperature anisotropy until marginal stability is reached. Numerical simulations of the Vlasov-Maxwell system of equations show excellent agreement with the growth-rate and real frequency of the unstable modes predicted by linear theory. The wave-amplitude of the EMEC waves at nonlinear saturation is consistent with magnetic trapping of the electrons.

AB - This paper presents a numerical study of the linear and nonlinear evolution of the electromagnetic electron-cyclotron (EMEC) instability in a bi-Kappa distributed plasma. Distributions with high energy tails described by the Kappa power-laws are often observed in collision-less plasmas (e.g., solar wind, accelerators), where wave-particle interactions control the plasma thermodynamics and keep the particle distributions out of Maxwellian equilibrium. Under certain conditions, the anisotropic bi-Kappa distribution gives rise to plasma instabilities creating low-frequency EMEC waves in the whistler branch. The instability saturates nonlinearly by reducing the temperature anisotropy until marginal stability is reached. Numerical simulations of the Vlasov-Maxwell system of equations show excellent agreement with the growth-rate and real frequency of the unstable modes predicted by linear theory. The wave-amplitude of the EMEC waves at nonlinear saturation is consistent with magnetic trapping of the electrons.

KW - electromagnetic electron-cyclotron instability

KW - bi-Kappa distributed plasma

KW - numerical simulations

UR - http://scitation.aip.org/content/aip/journal/pop/22/6/10.1063/1.4922479

U2 - 10.1063/1.4922479

DO - 10.1063/1.4922479

M3 - Article

VL - 22

JO - Physics of Plasmas

T2 - Physics of Plasmas

JF - Physics of Plasmas

SN - 1070-664X

IS - 6

M1 - 062109

ER -